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diff --git a/src/mailman/docs/version.txt b/src/mailman/docs/version.txt
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+System versions
+===============
+
+Mailman system information is available through the System object, which
+implements the ISystem interface.
+
+    >>> from mailman.interfaces.system import ISystem
+    >>> from mailman.core.system import system
+    >>> from zope.interface.verify import verifyObject
+
+    >>> verifyObject(ISystem, system)
+    True
+
+The Mailman version is available via the system object.
+
+    >>> print system.mailman_version
+    GNU Mailman ...
+
+The Python version running underneath is also available via the system
+object.
+
+    # The entire python_version string is variable, so this is the best test
+    # we can do.
+    >>> import sys
+    >>> system.python_version == sys.version
+    True