Index: reference/datamodel.rst
===================================================================
--- reference/datamodel.rst	(revision 66250)
+++ reference/datamodel.rst	(working copy)
@@ -1262,6 +1262,7 @@
    explicitly set to :const:`None`.
 
 .. method:: object.__bool__(self)
+
    .. index:: single: __len__() (mapping object method)
 
    Called to implement truth value testing, and the built-in operation ``bool()``;