Command completion in imaxima



Greetings.

I have missed command completion in imaxima, but today I noticed that
there _should_ be one; I just can not get it to work. In imaxima, when I
type

integrat

and type M-TAB, emacs says

No completions available...

What have I missed? I am running

GNU Emacs 23.2.1

and have installed

imaxima.el,v 1.24 2009/02/11

Thank you very much for your help in advance.

--

Jarmo