diff --git a/Doc/library/types.rst b/Doc/library/types.rst
index 71d7a126ac3..998816b4861 100644
--- a/Doc/library/types.rst
+++ b/Doc/library/types.rst
@@ -355,7 +355,9 @@ Additional Utility Classes and Functions
                return "{}({})".format(type(self).__name__, ", ".join(items))
 
            def __eq__(self, other):
-               return self.__dict__ == other.__dict__
+               if isinstance(self, SimpleNamespace) and isinstance(other, SimpleNamespace):
+                  return self.__dict__ == other.__dict__
+               return NotImplemented
 
    ``SimpleNamespace`` may be useful as a replacement for ``class NS: pass``.
    However, for a structured record type use :func:`~collections.namedtuple`