Commiting file which contains the next revision number

Is there a way to either get the next revision number, or better, to
specify a tag in a file such than when the file is committed the tag is
replaced with the revision in which it was commited.

By Example:
File <changes.txt>
        -Added support for x ($NextRevision$)

Stored file:
        -Added support for x (348)

I need/want this since I have (as shown) a changes log that I would like
to track the revision number each change is made in (of course if do a
commit first to get a number, then I need to recommit to store that
number for the changes file).

I've tried searching through the archives, but I can't think of the
keywords to sort out what I want (so many posts with "revision" in them).

-- 
edA-qa mort-ora-y
Idea Architect
http://disemia.com/
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