Add reference to solution for a commonly asked question.
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 3fda6a4..e5cc1b9 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1198,6 +1198,9 @@
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.__hash__(self)