diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 8713581d1c05ed..35cfb96ba09564 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -298,9 +298,10 @@ the :mod:`glob` module.)
device than *path*, or whether :file:`{path}/..` and *path* point to the same
i-node on the same device --- this should detect mount points for all Unix
and POSIX variants. It is not able to reliably detect bind mounts on the
- same filesystem. On Windows, a drive letter root and a share UNC are
- always mount points, and for any other path ``GetVolumePathName`` is called
- to see if it is different from the input path.
+ same filesystem. On Linux systems, it will always return ``True`` for btrfs
+ subvolumes, even if they aren't mount points. On Windows, a drive letter root
+ and a share UNC are always mount points, and for any other path
+ ``GetVolumePathName`` is called to see if it is different from the input path.
.. versionchanged:: 3.4
Added support for detecting non-root mount points on Windows.
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