Fix typo.
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 0baed15..32a7041 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -162,7 +162,7 @@
    error handler if the filesystem encoding is ``'mbcs'`` (which is the default
    encoding).
 
-   :func:`fsdencode` is the reverse function.
+   :func:`fsdecode` is the reverse function.
 
    .. versionadded:: 3.2