Resolve ticket updates

Often we will close tickets without including information on the
resolution (it may have been in a previous comment, or a user reopened a
ticket accidentally).

How can I make it so RT will only email me the resolution updates if
there is content in the ticket?

Fri Dec 03 14:11:45 2004: Request 1983 was acted upon.
Transaction: Status changed from open to resolved by [USER}
Queue: support
Owner: Nobody
Status: resolved