diff --git a/changelogs/client_server/newsfragments/2068.clarification b/changelogs/client_server/newsfragments/2068.clarification
new file mode 100644
index 000000000..1b3c13e8e
--- /dev/null
+++ b/changelogs/client_server/newsfragments/2068.clarification
@@ -0,0 +1 @@
+Clarify behaviour when the `topic` key of a `m.room.topic` event is absent, null, or empty.
diff --git a/data/event-schemas/schema/m.room.topic.yaml b/data/event-schemas/schema/m.room.topic.yaml
index 78a3d878a..56f0caf92 100644
--- a/data/event-schemas/schema/m.room.topic.yaml
+++ b/data/event-schemas/schema/m.room.topic.yaml
@@ -1,7 +1,14 @@
 ---
 allOf:
   - $ref: core-event-schema/state_event.yaml
-description: 'A topic is a short message detailing what is currently being discussed in the room.  It can also be used as a way to display extra information about the room, which may not be suitable for the room name. The room topic can also be set when creating a room using `/createRoom` with the `topic` key.'
+description: |- 
+    A topic is a short message detailing what is currently being discussed in the room.
+    It can also be used as a way to display extra information about the room, which may not
+    be suitable for the room name.
+    The room topic can also be set when creating a room using `/createRoom` with the `topic` key.'
+    
+    If the `topic` property is absent, null, or empty then the topic is unset. In other words,
+    an empty `topic` property effectively resets the room to having no topic.
 properties:
   content:
     properties: