Add reference to solution for a commonly asked question.
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 37640e5..d083af5 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1346,6 +1346,9 @@
Arguments to rich comparison methods are never coerced.
+ To automatically generate ordering operations from a single root operation,
+ see the `Total Ordering recipe in the ASPN cookbook
+ <http://code.activestate.com/recipes/576529/>`_\.
.. method:: object.__cmp__(self, other)