diff --git a/src/api/include/projectM-4/audio.h b/src/api/include/projectM-4/audio.h
index 23ee09d61..81bbec40f 100644
--- a/src/api/include/projectM-4/audio.h
+++ b/src/api/include/projectM-4/audio.h
@@ -2,6 +2,7 @@
  * @file audio.h
  * @copyright 2003-2024 projectM Team
  * @brief Functions to pass in audio data to libprojectM.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -38,6 +39,7 @@ extern "C" {
  * are added, only this number of samples is stored and the remainder discarded.
  *
  * @return The number of audio samples that are stored, per channel.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT unsigned int projectm_pcm_get_max_samples();
 
@@ -51,10 +53,11 @@ PROJECTM_EXPORT unsigned int projectm_pcm_get_max_samples();
  *
  * @param instance The projectM instance handle.
  * @param samples An array of PCM samples.
- * Each sample is expected to be within the range -1 to 1.
+ *                Each sample is expected to be within the range -1 to 1.
  * @param count The number of audio samples in a channel.
  * @param channels If the buffer is mono or stereo.
- * Can be PROJECTM_MONO or PROJECTM_STEREO.
+ *                 Can be PROJECTM_MONO, PROJECTM_STEREO or the actual numerical channel count.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_pcm_add_float(projectm_handle instance, const float* samples,
                                             unsigned int count, projectm_channels channels);
@@ -71,7 +74,8 @@ PROJECTM_EXPORT void projectm_pcm_add_float(projectm_handle instance, const floa
  * @param samples An array of PCM samples.
  * @param count The number of audio samples in a channel.
  * @param channels If the buffer is mono or stereo.
- * Can be PROJECTM_MONO or PROJECTM_STEREO.
+ *                 Can be PROJECTM_MONO, PROJECTM_STEREO or the actual numerical channel count.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_pcm_add_int16(projectm_handle instance, const int16_t* samples,
                                             unsigned int count, projectm_channels channels);
@@ -88,7 +92,8 @@ PROJECTM_EXPORT void projectm_pcm_add_int16(projectm_handle instance, const int1
  * @param samples An array of PCM samples.
  * @param count The number of audio samples in a channel.
  * @param channels If the buffer is mono or stereo.
- * Can be PROJECTM_MONO or PROJECTM_STEREO.
+ *                 Can be PROJECTM_MONO, PROJECTM_STEREO or the actual numerical channel count.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_pcm_add_uint8(projectm_handle instance, const uint8_t* samples,
                                             unsigned int count, projectm_channels channels);
diff --git a/src/api/include/projectM-4/callbacks.h b/src/api/include/projectM-4/callbacks.h
index 64b4c7946..e652855b2 100644
--- a/src/api/include/projectM-4/callbacks.h
+++ b/src/api/include/projectM-4/callbacks.h
@@ -2,6 +2,7 @@
  * @file callbacks.h
  * @copyright 2003-2024 projectM Team
  * @brief Functions and prototypes for projectM callbacks.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -36,7 +37,8 @@ extern "C" {
  *
  * @param is_hard_cut If true, the transition was triggered by a beat-driven event.
  * @param user_data A user-defined data pointer that was provided when registering the callback,
-*                   e.g. context information.
+ *                   e.g. context information.
+ * @since 4.0.0
  */
 typedef void (*projectm_preset_switch_requested_event)(bool is_hard_cut, void* user_data);
 
@@ -50,6 +52,7 @@ typedef void (*projectm_preset_switch_requested_event)(bool is_hard_cut, void* u
  * @param message The error message.
  * @param user_data A user-defined data pointer that was provided when registering the callback,
  *                  e.g. context information.
+ * @since 4.0.0
  */
 typedef void (*projectm_preset_switch_failed_event)(const char* preset_filename,
                                                     const char* message, void* user_data);
@@ -64,6 +67,7 @@ typedef void (*projectm_preset_switch_failed_event)(const char* preset_filename,
  * @param callback A pointer to the callback function.
  * @param user_data A pointer to any data that will be sent back in the callback, e.g. context
  *                  information.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_preset_switch_requested_event_callback(projectm_handle instance,
                                                                          projectm_preset_switch_requested_event callback,
@@ -78,6 +82,7 @@ PROJECTM_EXPORT void projectm_set_preset_switch_requested_event_callback(project
  * @param callback A pointer to the callback function.
  * @param user_data A pointer to any data that will be sent back in the callback, e.g. context
  *                  information.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_preset_switch_failed_event_callback(projectm_handle instance,
                                                                       projectm_preset_switch_failed_event callback,
diff --git a/src/api/include/projectM-4/core.h b/src/api/include/projectM-4/core.h
index 2188cc505..53c03b45e 100644
--- a/src/api/include/projectM-4/core.h
+++ b/src/api/include/projectM-4/core.h
@@ -2,6 +2,7 @@
  * @file core.h
  * @copyright 2003-2024 projectM Team
  * @brief Core functions to instantiate, destroy and control projectM.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -39,6 +40,7 @@ extern "C" {
  *
  * @return A projectM handle for the newly created instance that must be used in subsequent API calls.
  *         NULL if the instance could not be created successfully.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT projectm_handle projectm_create();
 
@@ -48,6 +50,7 @@ PROJECTM_EXPORT projectm_handle projectm_create();
  * After destroying the handle, it must not be used for any other calls to the API.
  *
  * @param instance A handle returned by projectm_create() or projectm_create_settings().
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_destroy(projectm_handle instance);
 
@@ -67,6 +70,7 @@ PROJECTM_EXPORT void projectm_destroy(projectm_handle instance);
  * @param instance The projectM instance handle.
  * @param filename The preset filename or URL to load.
  * @param smooth_transition If true, the new preset is smoothly blended over.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_load_preset_file(projectm_handle instance, const char* filename,
                                                bool smooth_transition);
@@ -83,6 +87,7 @@ PROJECTM_EXPORT void projectm_load_preset_file(projectm_handle instance, const c
  * @param instance The projectM instance handle.
  * @param data The preset contents to load.
  * @param smooth_transition If true, the new preset is smoothly blended over.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_load_preset_data(projectm_handle instance, const char* data,
                                                bool smooth_transition);
@@ -94,6 +99,7 @@ PROJECTM_EXPORT void projectm_load_preset_data(projectm_handle instance, const c
  * Can cause a small delay/lag in rendering. Only use if texture paths were changed.
  *
  * @param instance The projectM instance handle.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_reset_textures(projectm_handle instance);
 
@@ -105,6 +111,7 @@ PROJECTM_EXPORT void projectm_reset_textures(projectm_handle instance);
  * @param major A pointer to an int that will be set to the major version.
  * @param minor A pointer to an int that will be set to the minor version.
  * @param patch A pointer to an int that will be set to the patch version.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_get_version_components(int* major, int* minor, int* patch);
 
@@ -115,6 +122,7 @@ PROJECTM_EXPORT void projectm_get_version_components(int* major, int* minor, int
  * needed.
  *
  * @return The library version in the format major.minor.patch.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT char* projectm_get_version_string();
 
@@ -127,6 +135,7 @@ PROJECTM_EXPORT char* projectm_get_version_string();
  * needed.
  *
  * @return The VCS revision number the projectM library was built from.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT char* projectm_get_vcs_version_string();
 
diff --git a/src/api/include/projectM-4/debug.h b/src/api/include/projectM-4/debug.h
index 12c0e8d40..77b6231ae 100644
--- a/src/api/include/projectM-4/debug.h
+++ b/src/api/include/projectM-4/debug.h
@@ -2,6 +2,7 @@
  * @file debug.h
  * @copyright 2003-2024 projectM Team
  * @brief Debug functions for both libprojectM and preset developers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -47,6 +48,7 @@ extern "C" {
  *
  * @param instance The projectM instance handle.
  * @param output_file The filename to write the dump to or NULL.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_write_debug_image_on_next_frame(projectm_handle instance, const char* output_file);
 
diff --git a/src/api/include/projectM-4/memory.h b/src/api/include/projectM-4/memory.h
index 2ff0fb55c..2e2074eb1 100644
--- a/src/api/include/projectM-4/memory.h
+++ b/src/api/include/projectM-4/memory.h
@@ -2,6 +2,7 @@
  * @file memory.h
  * @copyright 2003-2024 projectM Team
  * @brief Memory allocation/deallocation helpers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -37,6 +38,7 @@ extern "C" {
  * To free the allocated memory, call projectm_free_string(). Do not use free()!
  *
  * @return A pointer to a zero-initialized memory area.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT char* projectm_alloc_string(unsigned int length);
 
@@ -49,6 +51,7 @@ PROJECTM_EXPORT char* projectm_alloc_string(unsigned int length);
  * <p>Do not use free() to delete the pointer!</p>
  *
  * @param str A pointer returned by projectm_alloc_string().
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_free_string(const char* str);
 
diff --git a/src/api/include/projectM-4/parameters.h b/src/api/include/projectM-4/parameters.h
index 04604abd4..a72d0c957 100644
--- a/src/api/include/projectM-4/parameters.h
+++ b/src/api/include/projectM-4/parameters.h
@@ -2,6 +2,7 @@
  * @file parameters.h
  * @copyright 2003-2024 projectM Team
  * @brief Functions to set and retrieve all sorts of projectM parameters and setting.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -40,6 +41,7 @@ extern "C" {
  * @param instance The projectM instance handle.
  * @param texture_search_paths A list of texture search paths.
  * @param count The number of paths in the list.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_texture_search_paths(projectm_handle instance,
                                                        const char** texture_search_paths,
@@ -63,6 +65,7 @@ PROJECTM_EXPORT void projectm_set_texture_search_paths(projectm_handle instance,
  *
  * @param instance The projectM instance handle.
  * @param seconds_since_first_frame Any value >= 0 to use user-specified timestamps, values < 0 will use the system clock.
+ * @since 4.2.0
  */
 PROJECTM_EXPORT void projectm_set_frame_time(projectm_handle instance, double seconds_since_first_frame);
 
@@ -74,6 +77,7 @@ PROJECTM_EXPORT void projectm_set_frame_time(projectm_handle instance, double se
  * @param instance The projectM instance handle.
  * @return Time elapsed since projectM was started, or the value of the user-specified time value used
  *         to render the last frame.
+ * @since 4.2.0
  */
 PROJECTM_EXPORT double projectm_get_last_frame_time(projectm_handle instance);
 
@@ -84,6 +88,7 @@ PROJECTM_EXPORT double projectm_get_last_frame_time(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param sensitivity The sensitivity setting.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_beat_sensitivity(projectm_handle instance, float sensitivity);
 
@@ -91,6 +96,7 @@ PROJECTM_EXPORT void projectm_set_beat_sensitivity(projectm_handle instance, flo
  * @brief Returns the beat sensitivity.
  * @param instance The projectM instance handle.
  * @return The current sensitivity setting.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT float projectm_get_beat_sensitivity(projectm_handle instance);
 
@@ -104,6 +110,7 @@ PROJECTM_EXPORT float projectm_get_beat_sensitivity(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param seconds Minimum number of seconds the preset will be displayed before a hard cut.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_hard_cut_duration(projectm_handle instance, double seconds);
 
@@ -111,6 +118,7 @@ PROJECTM_EXPORT void projectm_set_hard_cut_duration(projectm_handle instance, do
  * @brief Returns the minimum display time before a hard cut can happen.
  * @param instance The projectM instance handle.
  * @return The minimum number of seconds the preset will be displayed before a hard cut.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT double projectm_get_hard_cut_duration(projectm_handle instance);
 
@@ -122,6 +130,7 @@ PROJECTM_EXPORT double projectm_get_hard_cut_duration(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param enabled True to enable hard cuts, false to disable.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_hard_cut_enabled(projectm_handle instance, bool enabled);
 
@@ -129,6 +138,7 @@ PROJECTM_EXPORT void projectm_set_hard_cut_enabled(projectm_handle instance, boo
  * @brief Returns whether hard cuts are enabled or not.
  * @param instance The projectM instance handle.
  * @return True if hard cuts are enabled, false otherwise.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT bool projectm_get_hard_cut_enabled(projectm_handle instance);
 
@@ -139,6 +149,7 @@ PROJECTM_EXPORT bool projectm_get_hard_cut_enabled(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param sensitivity The volume threshold that triggers a hard cut if surpassed.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_hard_cut_sensitivity(projectm_handle instance, float sensitivity);
 
@@ -146,6 +157,7 @@ PROJECTM_EXPORT void projectm_set_hard_cut_sensitivity(projectm_handle instance,
  * @brief Returns the current hard cut sensitivity.
  * @param instance The projectM instance handle.
  * @return The current hard cut sensitivity.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT float projectm_get_hard_cut_sensitivity(projectm_handle instance);
 
@@ -157,6 +169,7 @@ PROJECTM_EXPORT float projectm_get_hard_cut_sensitivity(projectm_handle instance
  *
  * @param instance The projectM instance handle.
  * @param seconds Time in seconds it takes to smoothly transition from one preset to another.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_soft_cut_duration(projectm_handle instance, double seconds);
 
@@ -164,6 +177,7 @@ PROJECTM_EXPORT void projectm_set_soft_cut_duration(projectm_handle instance, do
  * @brief Returns the time in seconds for a soft transition between two presets.
  * @param instance The projectM instance handle.
  * @return Time in seconds it takes to smoothly transition from one preset to another.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT double projectm_get_soft_cut_duration(projectm_handle instance);
 
@@ -175,6 +189,7 @@ PROJECTM_EXPORT double projectm_get_soft_cut_duration(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param seconds The number of seconds a preset will be displayed before the next is shown.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_preset_duration(projectm_handle instance, double seconds);
 
@@ -186,16 +201,20 @@ PROJECTM_EXPORT void projectm_set_preset_duration(projectm_handle instance, doub
  *
  * @param instance The projectM instance handle.
  * @return The currently set preset display duration in seconds.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT double projectm_get_preset_duration(projectm_handle instance);
 
 /**
  * @brief Sets the per-pixel equation mesh size in units.
+ *
  * Will internally be clamped to [8,300] in each axis. If any dimension is set to an odd value, it will be incremented by 1
  * so only multiples of two are used.
+ *
  * @param instance The projectM instance handle.
  * @param width The new width of the mesh.
  * @param height The new height of the mesh.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_mesh_size(projectm_handle instance, size_t width, size_t height);
 
@@ -204,6 +223,7 @@ PROJECTM_EXPORT void projectm_set_mesh_size(projectm_handle instance, size_t wid
  * @param instance The projectM instance handle.
  * @param width The width of the mesh.
  * @param height The height of the mesh.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_get_mesh_size(projectm_handle instance, size_t* width, size_t* height);
 
@@ -216,6 +236,7 @@ PROJECTM_EXPORT void projectm_get_mesh_size(projectm_handle instance, size_t* wi
  *
  * @param instance The projectM instance handle.
  * @param fps The current FPS value projectM is running with.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_fps(projectm_handle instance, int32_t fps);
 
@@ -226,6 +247,7 @@ PROJECTM_EXPORT void projectm_set_fps(projectm_handle instance, int32_t fps);
  *
  * @param instance The projectM instance handle.
  * @return The current/average frames per second.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT int32_t projectm_get_fps(projectm_handle instance);
 
@@ -237,6 +259,7 @@ PROJECTM_EXPORT int32_t projectm_get_fps(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param enabled True to enable aspect correction, false to disable it.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_aspect_correction(projectm_handle instance, bool enabled);
 
@@ -244,6 +267,7 @@ PROJECTM_EXPORT void projectm_set_aspect_correction(projectm_handle instance, bo
  * @brief Returns whether aspect ratio correction is enabled or not.
  * @param instance The projectM instance handle.
  * @return True if aspect ratio correction is enabled, false otherwise.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT bool projectm_get_aspect_correction(projectm_handle instance);
 
@@ -258,6 +282,7 @@ PROJECTM_EXPORT bool projectm_get_aspect_correction(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param value The new "easter egg" value. Must be greater than zero, otherwise a default sigma value of 1.0 will be used.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_easter_egg(projectm_handle instance, float value);
 
@@ -265,6 +290,7 @@ PROJECTM_EXPORT void projectm_set_easter_egg(projectm_handle instance, float val
  * @brief Returns the current "easter egg" value.
  * @param instance The projectM instance handle.
  * @return The current "easter egg" value.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT float projectm_get_easter_egg(projectm_handle instance);
 
@@ -276,6 +302,7 @@ PROJECTM_EXPORT float projectm_get_easter_egg(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param lock True to lock the current preset, false to enable automatic transitions.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_preset_locked(projectm_handle instance, bool lock);
 
@@ -283,6 +310,7 @@ PROJECTM_EXPORT void projectm_set_preset_locked(projectm_handle instance, bool l
  * @brief Returns whether the current preset is locked or not.
  * @param instance The projectM instance handle.
  * @return True if the preset lock is enabled, false otherwise.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT bool projectm_get_preset_locked(projectm_handle instance);
 
@@ -294,6 +322,7 @@ PROJECTM_EXPORT bool projectm_get_preset_locked(projectm_handle instance);
  * @param instance The projectM instance handle.
  * @param width New viewport width in pixels.
  * @param height New viewport height in pixels.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_set_window_size(projectm_handle instance, size_t width, size_t height);
 
@@ -302,6 +331,7 @@ PROJECTM_EXPORT void projectm_set_window_size(projectm_handle instance, size_t w
  * @param instance The projectM instance handle.
  * @param width Valid pointer to a size_t variable that will receive the window width value.
  * @param height Valid pointer to a size_t variable that will receive the window height value.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_get_window_size(projectm_handle instance, size_t* width, size_t* height);
 
diff --git a/src/api/include/projectM-4/projectM.h b/src/api/include/projectM-4/projectM.h
index 28a01d427..ba4f70a79 100644
--- a/src/api/include/projectM-4/projectM.h
+++ b/src/api/include/projectM-4/projectM.h
@@ -2,6 +2,7 @@
  * @file projectM.h
  * @copyright 2003-2024 projectM Team
  * @brief Convenience include file that includes all other API headers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  *
diff --git a/src/api/include/projectM-4/render_opengl.h b/src/api/include/projectM-4/render_opengl.h
index 348cec080..c40c7bbdc 100644
--- a/src/api/include/projectM-4/render_opengl.h
+++ b/src/api/include/projectM-4/render_opengl.h
@@ -35,6 +35,7 @@ extern "C" {
  * @brief Renders a single frame.
  *
  * @param instance The projectM instance handle.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_opengl_render_frame(projectm_handle instance);
 
@@ -43,6 +44,7 @@ PROJECTM_EXPORT void projectm_opengl_render_frame(projectm_handle instance);
  *
  * @param instance The projectM instance handle.
  * @param framebuffer_object_id The OpenGL FBO ID to render to.
+ * @since 4.2.0
  */
 PROJECTM_EXPORT void projectm_opengl_render_frame_fbo(projectm_handle instance, uint32_t framebuffer_object_id);
 
diff --git a/src/api/include/projectM-4/touch.h b/src/api/include/projectM-4/touch.h
index aa9a3d46c..b73c5131e 100644
--- a/src/api/include/projectM-4/touch.h
+++ b/src/api/include/projectM-4/touch.h
@@ -2,6 +2,7 @@
  * @file touch.h
  * @copyright 2003-2024 projectM Team
  * @brief Touch-related functions to add random waveforms.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -43,6 +44,7 @@ extern "C" {
  * @param y The y coordinate of the touch event.
  * @param pressure  The amount of pressure applied in a range from 0.0 to 1.0.
  * @param touch_type The waveform type that will be rendered on touch.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_touch(projectm_handle instance, float x, float y,
                                     int pressure, projectm_touch_type touch_type);
@@ -53,6 +55,7 @@ PROJECTM_EXPORT void projectm_touch(projectm_handle instance, float x, float y,
  * @param x The x coordinate of the drag.
  * @param y the y coordinate of the drag.
  * @param pressure The amount of pressure applied in a range from 0.0 to 1.0.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_touch_drag(projectm_handle instance, float x, float y, int pressure);
 
@@ -61,6 +64,7 @@ PROJECTM_EXPORT void projectm_touch_drag(projectm_handle instance, float x, floa
  * @param instance The projectM instance handle.
  * @param x The last known x touch coordinate.
  * @param y The last known y touch coordinate.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_touch_destroy(projectm_handle instance, float x, float y);
 
@@ -70,6 +74,7 @@ PROJECTM_EXPORT void projectm_touch_destroy(projectm_handle instance, float x, f
  * Preset-defined waveforms will still be displayed.
  *
  * @param instance The projectM instance handle.
+ * @since 4.0.0
  */
 PROJECTM_EXPORT void projectm_touch_destroy_all(projectm_handle instance);
 
diff --git a/src/api/include/projectM-4/types.h b/src/api/include/projectM-4/types.h
index c33cc8bc7..56b373064 100644
--- a/src/api/include/projectM-4/types.h
+++ b/src/api/include/projectM-4/types.h
@@ -2,6 +2,7 @@
  * @file types.h
  * @copyright 2003-2024 projectM Team
  * @brief Types and enumerations used in the other API headers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -40,6 +41,7 @@ typedef struct projectm* projectm_handle; //!< A pointer to the opaque projectM
 
 /**
  * For specifying audio data format.
+ * @since 4.0.0
  */
 typedef enum
 {
@@ -49,6 +51,7 @@ typedef enum
 
 /**
  * Placeholder values that can be used to address channel indices in PCM data arrays.
+ * @since 4.0.0
  */
 typedef enum
 {
@@ -60,6 +63,7 @@ typedef enum
 
 /**
  * Waveform render types used in the touch start method.
+ * @since 4.0.0
  */
 typedef enum
 {
diff --git a/src/playlist/api/projectM-4/playlist.h b/src/playlist/api/projectM-4/playlist.h
index be133b851..26fb5c393 100644
--- a/src/playlist/api/projectM-4/playlist.h
+++ b/src/playlist/api/projectM-4/playlist.h
@@ -2,6 +2,7 @@
  * @file playlist.h
  * @copyright 2003-2024 projectM Team
  * @brief Optional playlist API for libprojectM.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
diff --git a/src/playlist/api/projectM-4/playlist_callbacks.h b/src/playlist/api/projectM-4/playlist_callbacks.h
index 9b9f3529b..477613c17 100644
--- a/src/playlist/api/projectM-4/playlist_callbacks.h
+++ b/src/playlist/api/projectM-4/playlist_callbacks.h
@@ -2,6 +2,7 @@
  * @file playlist_callbacks.h
  * @copyright 2003-2024 projectM Team
  * @brief Functions and prototypes for projectM playlist callbacks.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -42,6 +43,7 @@ extern "C" {
  * @param index The playlist index of the new preset.
  * @param user_data A user-defined data pointer that was provided when registering the callback,
  *                  e.g. context information.
+ * @since 4.0.0
  */
 typedef void (*projectm_playlist_preset_switched_event)(bool is_hard_cut, unsigned int index,
                                                         void* user_data);
@@ -61,6 +63,7 @@ typedef void (*projectm_playlist_preset_switched_event)(bool is_hard_cut, unsign
  * @param message The last error message.
  * @param user_data A user-defined data pointer that was provided when registering the callback,
  *                  e.g. context information.
+ * @since 4.0.0
  */
 typedef void (*projectm_playlist_preset_switch_failed_event)(const char* preset_filename,
                                                              const char* message, void* user_data);
@@ -75,6 +78,7 @@ typedef void (*projectm_playlist_preset_switch_failed_event)(const char* preset_
  * @param callback A pointer to the callback function.
  * @param user_data A pointer to any data that will be sent back in the callback, e.g. context
  *                  information.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_preset_switched_event_callback(projectm_playlist_handle instance,
                                                                                    projectm_playlist_preset_switched_event callback,
@@ -94,6 +98,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_preset_switched_event_callba
  * @param callback A pointer to the callback function.
  * @param user_data A pointer to any data that will be sent back in the callback, e.g. context
  *                  information.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_preset_switch_failed_event_callback(projectm_playlist_handle instance,
                                                                                         projectm_playlist_preset_switch_failed_event callback,
diff --git a/src/playlist/api/projectM-4/playlist_core.h b/src/playlist/api/projectM-4/playlist_core.h
index e82ac24b6..5fb69ddff 100644
--- a/src/playlist/api/projectM-4/playlist_core.h
+++ b/src/playlist/api/projectM-4/playlist_core.h
@@ -2,6 +2,7 @@
  * @file playlist_core.h
  * @copyright 2003-2024 projectM Team
  * @brief Core functions to instantiate, destroy and connect a projectM playlist.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -35,42 +36,61 @@ extern "C" {
 /**
  * @brief Creates a playlist manager for the given projectM instance
  *
- * Only one active playlist manager is supported per projectM instance. If multiple playlists use
+ * <p>Only one active playlist manager is supported per projectM instance. If multiple playlists use
  * the same projectM instance, only the last created playlist manager will receive preset change
- * callbacks from the projectM instance.
+ * callbacks from the projectM instance.</p>
  *
- * To switch to another playlist, use the projectm_playlist_connect() method.
+ * <p>To switch to another playlist, use the <tt>projectm_playlist_connect()</tt> method.</p>
+ *
+ * @important <p>If the projectM handle is not NULL, this method will register the playlist manager with the
+ *            <tt>projectm_preset_switch_requested_event</tt> and <tt>projectm_preset_switch_failed_event</tt> callbacks
+ *            of the referenced projectM instance. Setting any one of those callbacks to another function pointer
+ *            afterwards will cause the playlist manager to no longer being able to switch presets.</p>
+ *            <p>If the callback needs to be changed temporarily, the playlist functionality can be restored by calling
+ *            <tt>projectm_playlist_connect()</tt>, which will re-register the callbacks.</p>
  *
  * @param projectm_instance The projectM instance to connect to. Can be a null pointer to leave the newly
  *                          created playlist instance unconnected.
  * @return An opaque pointer to the newly created playlist manager instance. Null if creation failed.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT projectm_playlist_handle projectm_playlist_create(projectm_handle projectm_instance);
 
 /**
  * @brief Destroys a previously created playlist manager.
  *
- * If the playlist manager is currently connected to a projectM instance, it will be disconnected.
+ * If the playlist manager is currently connected to a projectM instance, it will be disconnected
+ * by resetting the <tt>projectm_preset_switch_requested_event</tt> and
+ * <tt>projectm_preset_switch_failed_event</tt> callbacks to NULL.
  *
  * @param instance The playlist manager instance to destroy.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_destroy(projectm_playlist_handle instance);
 
 /**
  * @brief Connects the playlist manager to a projectM instance.
  *
- * Sets or removes the preset switch callbacks and stores the projectM instance handle for use with
- * manual preset switches via the playlist API.
+ * <p>Sets or removes the preset switch callbacks and stores the projectM instance handle for use with
+ * manual preset switches via the playlist API.</p>
  *
- * When switching between multiple playlist managers, first call this method on the last used
+ * <p>When switching between multiple playlist managers, first call this method on the last used
  * playlist manager with a null pointer for the projectM instance, then call this method with the
  * actual projectM instance on the playlist manager that should be activated. It is also safe to
- * call projectm_playlist_connect() with a null projectM handle on all playlist manager instances
- * before activating a single one with a valid, non-null projectM handle.
+ * call <tt>projectm_playlist_connect()</tt> with a null projectM handle on all playlist manager instances
+ * before activating a single one with a valid, non-null projectM handle.</p>
+ *
+ * @important <p>If the projectM handle is not NULL, this method will register the playlist manager with the
+ *            <tt>projectm_preset_switch_requested_event</tt> and <tt>projectm_preset_switch_failed_event</tt> callbacks
+ *            of the referenced projectM instance. Setting any one of those callbacks to another function pointer
+ *            afterwards will cause the playlist manager to no longer being able to switch presets.</p>
+ *            <p>If the callback needs to be changed temporarily, the playlist functionality can be restored by calling
+ *            <tt>projectm_playlist_connect()</tt>, which will re-register the callbacks.</p>
  *
  * @param instance The playlist manager instance.
  * @param projectm_instance The projectM instance to connect to. Can be a null pointer to remove
  *                          an existing binding and clear the projectM preset switch callback.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_connect(projectm_playlist_handle instance, projectm_handle projectm_instance);
 
diff --git a/src/playlist/api/projectM-4/playlist_filter.h b/src/playlist/api/projectM-4/playlist_filter.h
index 911e9cec0..d91ae3d35 100644
--- a/src/playlist/api/projectM-4/playlist_filter.h
+++ b/src/playlist/api/projectM-4/playlist_filter.h
@@ -2,6 +2,7 @@
  * @file playlist_filter.h
  * @copyright 2003-2024 projectM Team
  * @brief Playlist filter functions.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -67,6 +68,7 @@ extern "C" {
  * @param instance The playlist manager instance.
  * @param filter_list An array with filter strings.
  * @param count The size of the filter array.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_filter(projectm_playlist_handle instance, const char** filter_list,
                                                            size_t count);
@@ -80,6 +82,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_filter(projectm_playlist_han
  * @param instance The playlist manager instance.
  * @param[out] count The size of the filter array.
  * @return An array with filter strings.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT char** projectm_playlist_get_filter(projectm_playlist_handle instance, size_t* count);
 
@@ -91,6 +94,7 @@ PROJECTM_PLAYLIST_EXPORT char** projectm_playlist_get_filter(projectm_playlist_h
  *
  * @param instance The playlist manager instance.
  * @return The number of removed items.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT size_t projectm_playlist_apply_filter(projectm_playlist_handle instance);
 
diff --git a/src/playlist/api/projectM-4/playlist_items.h b/src/playlist/api/projectM-4/playlist_items.h
index c0cac5efc..020286ec7 100644
--- a/src/playlist/api/projectM-4/playlist_items.h
+++ b/src/playlist/api/projectM-4/playlist_items.h
@@ -2,6 +2,7 @@
  * @file playlist_items.h
  * @copyright 2003-2024 projectM Team
  * @brief Playlist item management functions.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -35,12 +36,14 @@ extern "C" {
  * @brief Returns the number of presets in the current playlist.
  * @param instance The playlist manager instance.
  * @return The number of presets in the current playlist.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_size(projectm_playlist_handle instance);
 
 /**
  * @brief Clears the playlist.
  * @param instance The playlist manager instance to clear.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_clear(projectm_playlist_handle instance);
 
@@ -60,6 +63,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_clear(projectm_playlist_handle i
  * @param count The maximum number if items to return.
  * @return A pointer to a list of char pointers, each containing a single preset. The last entry
  *         is denoted by a null pointer.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT char** projectm_playlist_items(projectm_playlist_handle instance, uint32_t start, uint32_t count);
 
@@ -72,6 +76,7 @@ PROJECTM_PLAYLIST_EXPORT char** projectm_playlist_items(projectm_playlist_handle
  * @param index The index to retrieve the filename for.
  * @return The filename of the requested preset, or NULL if the index was out of bounds or the
  *         playlist is empty.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT char* projectm_playlist_item(projectm_playlist_handle instance, uint32_t index);
 
@@ -90,6 +95,7 @@ PROJECTM_PLAYLIST_EXPORT char* projectm_playlist_item(projectm_playlist_handle i
  * @param allow_duplicates If true, files found will always be added. If false, only files are
  *                         added that do not already exist in the current playlist.
  * @return The number of files added. 0 may indicate issues scanning the path.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_add_path(projectm_playlist_handle instance, const char* path,
                                                              bool recurse_subdirs, bool allow_duplicates);
@@ -112,6 +118,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_add_path(projectm_playlist_h
  * @param allow_duplicates If true, files found will always be added. If false, only files are
  *                         added that do not already exist in the current playlist.
  * @return The number of files added. 0 may indicate issues scanning the path.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_insert_path(projectm_playlist_handle instance, const char* path,
                                                                 uint32_t index, bool recurse_subdirs, bool allow_duplicates);
@@ -128,6 +135,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_insert_path(projectm_playlis
  *                         current playlist.
  * @return True if the file was added to the playlist, false if the file was a duplicate and
  *         allow_duplicates was set to false.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_add_preset(projectm_playlist_handle instance, const char* filename,
                                                            bool allow_duplicates);
@@ -149,6 +157,7 @@ PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_add_preset(projectm_playlist_han
  *                         current playlist.
  * @return True if the file was added to the playlist, false if the file was a duplicate and
  *         allow_duplicates was set to false.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_insert_preset(projectm_playlist_handle instance, const char* filename,
                                                               uint32_t index, bool allow_duplicates);
@@ -165,6 +174,7 @@ PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_insert_preset(projectm_playlist_
  *                         is only added to the playlist if the exact filename doesn't exist in the
  *                         current playlist.
  * @return The number of files added to the playlist. Ranges between 0 and count.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_add_presets(projectm_playlist_handle instance, const char** filenames,
                                                                 uint32_t count, bool allow_duplicates);
@@ -186,6 +196,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_add_presets(projectm_playlis
  *                         is only added to the playlist if the exact filename doesn't exist in the
  *                         current playlist.
  * @return The number of files added to the playlist. Ranges between 0 and count.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_insert_presets(projectm_playlist_handle instance, const char** filenames,
                                                                    uint32_t count, unsigned int index, bool allow_duplicates);
@@ -197,6 +208,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_insert_presets(projectm_play
  * @param index The preset index to remove. If it exceeds the playlist size, no preset will be
  *              removed.
  * @return True if the preset was removed from the playlist, false if the index was out of range.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_remove_preset(projectm_playlist_handle instance, uint32_t index);
 
@@ -208,6 +220,7 @@ PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_remove_preset(projectm_playlist_
  *              removed.
  * @param count The number of presets to remove from the given index.
  * @return The number of presets removed from the playlist.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_remove_presets(projectm_playlist_handle instance, uint32_t index,
                                                                    uint32_t count);
@@ -231,6 +244,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_remove_presets(projectm_play
  * @param count The number of items, beginning at start_index, to sort.
  * @param predicate The predicate to use for sorting. Default is SORT_PREDICATE_FULL_PATH.
  * @param order The sort order. Default is SORT_ORDER_ASCENDING.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_sort(projectm_playlist_handle instance, uint32_t start_index, uint32_t count,
                                                      projectm_playlist_sort_predicate predicate, projectm_playlist_sort_order order);
diff --git a/src/playlist/api/projectM-4/playlist_memory.h b/src/playlist/api/projectM-4/playlist_memory.h
index aa8560bda..40e9d5ed0 100644
--- a/src/playlist/api/projectM-4/playlist_memory.h
+++ b/src/playlist/api/projectM-4/playlist_memory.h
@@ -2,6 +2,7 @@
  * @file playlist_memory.h
  * @copyright 2003-2024 projectM Team
  * @brief Memory allocation/deallocation helpers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -38,6 +39,7 @@ extern "C" {
  * other projectM memory management functions with pointers returned by the playlist library.
  *
  * @param string A pointer to a string that should be freed.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_free_string(char* string);
 
@@ -48,6 +50,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_free_string(char* string);
  * other projectM memory management functions with pointers returned by the playlist library.
  *
  * @param array The pointer to the array of strings that should be freed.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_free_string_array(char** array);
 
diff --git a/src/playlist/api/projectM-4/playlist_playback.h b/src/playlist/api/projectM-4/playlist_playback.h
index dcef349fd..20ba00bbc 100644
--- a/src/playlist/api/projectM-4/playlist_playback.h
+++ b/src/playlist/api/projectM-4/playlist_playback.h
@@ -2,6 +2,7 @@
  * @file playlist_playback.h
  * @copyright 2003-2024 projectM Team
  * @brief Playback control functions.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -35,6 +36,7 @@ extern "C" {
  * @brief Enable or disable shuffle mode.
  * @param instance The playlist manager instance.
  * @param shuffle True to enable random shuffling, false to play presets in playlist order.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_shuffle(projectm_playlist_handle instance, bool shuffle);
 
@@ -42,6 +44,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_shuffle(projectm_playlist_ha
  * @brief Retrieves the current state of shuffle mode.
  * @param instance The playlist manager instance.
  * @return True if shuffle mode is enabled, false otherwise.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_get_shuffle(projectm_playlist_handle instance);
 
@@ -51,6 +54,7 @@ PROJECTM_PLAYLIST_EXPORT bool projectm_playlist_get_shuffle(projectm_playlist_ha
  * @param instance The playlist manager instance.
  * @param retry_count The number of retries after failed preset switches. Default is 5. Set to 0
  *                    to simply forward the failure event from projectM.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_retry_count(projectm_playlist_handle instance, uint32_t retry_count);
 
@@ -58,6 +62,7 @@ PROJECTM_PLAYLIST_EXPORT void projectm_playlist_set_retry_count(projectm_playlis
  * @brief Returns the number of retries after failed preset switches.
  * @param instance The playlist manager instance.
  * @return The number of retries after failed preset switches.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_get_retry_count(projectm_playlist_handle instance);
 
@@ -74,6 +79,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_get_retry_count(projectm_pla
  * @param new_position The new position to jump to.
  * @param hard_cut If true, the preset transition is instant. If true, a smooth transition is played.
  * @return The new playlist position. If the playlist is empty, 0 will be returned.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_set_position(projectm_playlist_handle instance, uint32_t new_position,
                                                                  bool hard_cut);
@@ -82,6 +88,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_set_position(projectm_playli
  * @brief Returns the current playlist position.
  * @param instance The playlist manager instance.
  * @return The current playlist position. If the playlist is empty, 0 will be returned.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_get_position(projectm_playlist_handle instance);
 
@@ -96,6 +103,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_get_position(projectm_playli
  * @param instance The playlist manager instance.
  * @param hard_cut If true, the preset transition is instant. If true, a smooth transition is played.
  * @return The new playlist position. If the playlist is empty, 0 will be returned.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_play_next(projectm_playlist_handle instance, bool hard_cut);
 
@@ -110,6 +118,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_play_next(projectm_playlist_
  * @param instance The playlist manager instance.
  * @param hard_cut If true, the preset transition is instant. If true, a smooth transition is played.
  * @return The new playlist position. If the playlist is empty, 0 will be returned.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_play_previous(projectm_playlist_handle instance, bool hard_cut);
 
@@ -128,6 +137,7 @@ PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_play_previous(projectm_playl
  * @param instance The playlist manager instance.
  * @param hard_cut If true, the preset transition is instant. If true, a smooth transition is played.
  * @return The new playlist position. If the playlist is empty, 0 will be returned.
+ * @since 4.0.0
  */
 PROJECTM_PLAYLIST_EXPORT uint32_t projectm_playlist_play_last(projectm_playlist_handle instance, bool hard_cut);
 
diff --git a/src/playlist/api/projectM-4/playlist_types.h b/src/playlist/api/projectM-4/playlist_types.h
index 4d124491c..e2ba425f7 100644
--- a/src/playlist/api/projectM-4/playlist_types.h
+++ b/src/playlist/api/projectM-4/playlist_types.h
@@ -2,6 +2,7 @@
  * @file playlist_types.h
  * @copyright 2003-2024 projectM Team
  * @brief Types and enumerations used in the playlist API headers.
+ * @since 4.0.0
  *
  * projectM -- Milkdrop-esque visualisation SDK
  * Copyright (C)2003-2024 projectM Team
@@ -31,11 +32,21 @@
 extern "C" {
 #endif
 
-struct projectm_playlist;                                   //!< Opaque projectM playlist instance type.
-typedef struct projectm_playlist* projectm_playlist_handle; //!< A pointer to the opaque projectM playlist instance.
+/**
+ * Opaque projectM playlist instance type.
+ * @since 4.0.0
+ */
+struct projectm_playlist;
+
+/**
+ * A pointer to the opaque projectM playlist instance.
+ * @since 4.0.0
+ */
+typedef struct projectm_playlist* projectm_playlist_handle;
 
 /**
  * Sort predicate for playlist sorting.
+ * @since 4.0.0
  */
 typedef enum
 {
@@ -46,6 +57,7 @@ typedef enum
 
 /**
  * Sort order for playlist sorting.
+ * @since 4.0.0
  */
 typedef enum
 {