From 399ff09961bbe8b6688267e7bd2f7f056bae5dc5 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Fri, 20 Mar 2009 18:30:29 +0000
Subject: [PATCH] Add MutableSet example.

---
 Doc/library/collections.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index a860a53a719..4ef0ca4488e 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -147,8 +147,12 @@ Notes on using :class:`Set` and :class:`MutableSet` as a mixin:
    inherit from both :meth:`Set` and :meth:`Hashable`, then define
    ``__hash__ = Set._hash``.
 
-(For more about ABCs, see the :mod:`abc` module and :pep:`3119`.)
+.. seealso::
 
+   * `OrderedSet recipe <http://code.activestate.com/recipes/576694/>`_ for an
+     example built on :class:`MutableSet`.
+
+   * For more about ABCs, see the :mod:`abc` module and :pep:`3119`.
 
 
 .. _deque-objects: