During Debian packaging of pgAdmin III it come up that the distributed
package contains no changelog, news, or history information that would
allow users to see why they might want to upgrade. Something like
<http://www.pgadmin.org/news.php> should be fine if you put it into a
NEWS file. Alternatively, put it into the pgAdmin documentation
itself, although that is harder to access when people are just
considering the installation of the package. Or maybe you have a
different idea, but I can see why users are having trouble here.