diff --git a/test_extclass.py b/test_extclass.py
index d9194ffe..4531b405 100644
--- a/test_extclass.py
+++ b/test_extclass.py
@@ -1,4 +1,5 @@
-r'''//  (C) Copyright David Abrahams 2000. Permission to copy, use, modify, sell and
+r'''
+//  (C) Copyright David Abrahams 2000. Permission to copy, use, modify, sell and
 //  distribute this software is granted provided this copyright notice appears
 //  in all copies. This software is provided "as is" without express or implied
 //  warranty, and with no claim as to its suitability for any purpose.
@@ -966,6 +967,11 @@ test inheritB2
     TypeError: bad operand type(s) for pow()
 
 Test operator export to a subclass
+
+    # force method table sharing
+    >>> class IntDerived1(Int): pass
+    ...
+
     >>> class IntDerived(Int):
     ...     def __init__(self, i):
     ...             Int.__init__(self, i)