When I move a package from the someone's contrib folder I create a brief entry in the changelog.txt file that is read by gslapt. I've questioned the brevity of what is shown in gslapt versus what I actually put in the text file. A recent example of the standard entry in changelog.txt:
net/amsn-0.98.3-i586-1vl60.tlz Upgraded to amsn-0.98.3
This upgrade has bug fixes and new features.
For more information see:http://amsn.sourceforge.net/
(*Bug fix and Features release*)
If you look at what gslapt shows:
Upgraded to amsn-0.98.3
It would be better IMO if the full entry was available so that users could at least go to the the package's web site and look at a complete/detailed changelog. If you're wanting to include the full changelog that comes with the source code I'm not sure how to arrange that.