#1718017: document the relation of os.path and the posixpath, ntpath etc. modules better.
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 01406e0..0e7f376 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -1,11 +1,9 @@
-
:mod:`os.path` --- Common pathname manipulations
================================================
.. module:: os.path
:synopsis: Operations on pathnames.
-
.. index:: single: path; operations
This module implements some useful functions on pathnames. To read or
@@ -18,6 +16,22 @@
:func:`splitunc` and :func:`ismount` do handle them correctly.
+.. note::
+
+ Since different operating systems have different path name conventions, there
+ are several versions of this module in the standard library. The
+ :mod:`os.path` module is always the path module suitable for the operating
+ system Python is running on, and therefore usable for local paths. However,
+ you can also import and use the individual modules if you want to manipulate
+ a path that is *always* in one of the different formats. They all have the
+ same interface:
+
+ * :mod:`posixpath` for UNIX-style paths
+ * :mod:`ntpath` for Windows paths
+ * :mod:`macpath` for old-style MacOS paths
+ * :mod:`os2emxpath` for OS/2 EMX paths
+
+
.. function:: abspath(path)
Return a normalized absolutized version of the pathname *path*. On most