Add missing label.
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 49f2be6..622c7f4 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1160,6 +1160,7 @@
    The return value must be a string object.
 
 
+.. _richcmpfuncs:
 .. method:: object.__lt__(self, other)
             object.__le__(self, other)
             object.__eq__(self, other)