I hadn't thought about comments, but that would only work after the fact.
I'm thinking more along the lines of the "Intellisense" popups like in the
VBA editor. That will assist the user as they enter the formula. Not as
involved as the Formula Editor, but an assist.
Nevermind - I just figured out why it wont' work. I'm trying to figure out
if I can have Excel prompt the user entering the formula. But if the formula
is home-grown, then it has to be calculated before Excel will even try and
figure out what it does.
OK.

Bummer.