Normalize spelling of Mac OS X.
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index bc2220d..01406e0 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -190,9 +190,9 @@
 
 .. function:: normcase(path)
 
-   Normalize the case of a pathname.  On Unix and MacOSX, this returns the path unchanged; on
-   case-insensitive filesystems, it converts the path to lowercase.  On Windows, it
-   also converts forward slashes to backward slashes.
+   Normalize the case of a pathname.  On Unix and Mac OS X, this returns the
+   path unchanged; on case-insensitive filesystems, it converts the path to
+   lowercase.  On Windows, it also converts forward slashes to backward slashes.
 
 
 .. function:: normpath(path)