Index: Doc/library/os.rst
===================================================================
--- Doc/library/os.rst	(revision 81160)
+++ Doc/library/os.rst	(working copy)
@@ -2178,8 +2178,8 @@
 
 .. data:: devnull
 
-   The file path of the null device. For example: ``'/dev/null'`` for POSIX.
-   Also available via :mod:`os.path`.
+   The file path of the null device. For example: ``'/dev/null'`` for
+   POSIX, ``'nul'`` for Windows.  Also available via :mod:`os.path`.
 
 
 .. _os-miscfunc: