Using update-menus?

[glhenni@cs.sandia.gov (Gary L. Hennigan)]

I have mathematica installed on my system and was thinking it'd be
nice to make this available via the menus. I know Debian has a nice
method of doing things like this but I can't seem to make it work. I
THOUGHT it was as easy as adding a menu entry in /etc/menu, so I
installed a file called /etc/menu/mathematica with the contents:

?package(mathematica):\
 needs=x11\
 section=Apps/Math\
 title="Mathematica"\
 command=/usr/local/bin/mathematica

and ran update-menus. Unfortunately I must be missing something
because the entry didn't show up in my WindowMaker menu. Apps/Math
only contains:

Xcalc
bc
dc

I tried various things, including a reboot, and a "update-menus -v",
but I didn't see anything that was of use to me. Can someone shed some 
light on what I'm missing here?

Thanks,
Gary