How do I get ifile to tell me "why"?

I've been using ifile for just a few days and have been quite impressed with
how well it's working.  (I also use SpamAssassin and am involved with the
Python-based spambayes project.)  For the most part, ifile categorizes
things well even though I have so far fed it very few messages (114 non-spam
and 248 spam messages in 13 categories, "spam", "virus" and 13 others).  The
results are so good in fact, that except for spam (which I file somewhat
differently), I've only been training ifile with messages it miscategorizes.

When it does miscategorize a message, it is frequently a doozie.  For
example, a message about Triumph cars just turned up in my Python
(programming language, not snakes) folder.  Accordingly, I wonder if there
is some way to coax ifile into telling me what words were most important to
it in making its decision.  I know about the -q flag.  That just tells me
how well the message relates to my various categories, not how it arrived at
the result it got.

Thanks,

-- 
Skip Montanaro
[email protected]
consulting: http://manatee.mojam.com/~skip/resume.html