Classmethod example needs to inherit from object
diff --git a/Doc/howto/descriptor.rst b/Doc/howto/descriptor.rst
index 0db96d6..f793562 100644
--- a/Doc/howto/descriptor.rst
+++ b/Doc/howto/descriptor.rst
@@ -409,7 +409,7 @@
 :func:`dict.fromkeys` creates a new dictionary from a list of keys.  The pure
 Python equivalent is::
 
-    class Dict:
+    class Dict(object):
         . . .
         def fromkeys(klass, iterable, value=None):
             "Emulate dict_fromkeys() in Objects/dictobject.c"