The following minimal script:
-----------------------------
import cmd
class C(cmd.Cmd): pass
C().cmdloop()

Creates the following help display:
-----------------------------------
(Cmd) help

Undocumented commands:
======================
help

For people who are consistently documenting their other commands, it is annoying to have anything at all listed in the "undocumented section".  So, help should have it's own default help message.