diff --git a/Doc/library/glob.rst b/Doc/library/glob.rst
index 0e4cfe7ebed797..293c2c4fed62fd 100644
--- a/Doc/library/glob.rst
+++ b/Doc/library/glob.rst
@@ -77,6 +77,10 @@ For example, ``'[?]'`` matches the character ``'?'``.
       Using the "``**``" pattern in large directory trees may consume
       an inordinate amount of time.
 
+   .. note::
+      This function may return duplicate path names if *pathname*
+      contains multiple "``**``" patterns and *recursive* is true.
+
    .. versionchanged:: 3.5
       Support for recursive globs using "``**``".
 
@@ -96,6 +100,10 @@ For example, ``'[?]'`` matches the character ``'?'``.
    .. audit-event:: glob.glob pathname,recursive glob.iglob
    .. audit-event:: glob.glob/2 pathname,recursive,root_dir,dir_fd glob.iglob
 
+   .. note::
+      This function may return duplicate path names if *pathname*
+      contains multiple "``**``" patterns and *recursive* is true.
+
    .. versionchanged:: 3.5
       Support for recursive globs using "``**``".