diff --git a/doc/menu.txt b/doc/menu.txt
index 662acb5..abae2de 100644
--- a/doc/menu.txt
+++ b/doc/menu.txt
@@ -1,9 +1,10 @@
 Creating and Rendering Menus
 ============================
 
-We first set up a test environment:
+We first set up a test and working environment:
 
     >>> from zope.app.testing import ztapi
+    >>> from cybertools.menu import Menu
 
 Create a menu:
 
diff --git a/interfaces.py b/interfaces.py
index f14f179..45ed4d4 100644
--- a/interfaces.py
+++ b/interfaces.py
@@ -28,7 +28,7 @@ from zope.app.container.interfaces import IOrderedContainer
 from zope.schema import Text, TextLine, List, Object, Int
 
 
-class IMenu(Interface):
+class IMenu(IOrderedContainer):
     """ A Menu.
     """