https://help.launchpad.net/Packaging/PPA/Uploading could do with adding a pointer about .changes files

The page:
https://help.launchpad.net/Packaging/PPA/Uploading

(and for that matter the dput manual page)

could do with adding a note saying that the 'source.changes' is typically generated by debuild.

I was initially confused from the description thinking it was a diff of some type (and then wondered
how it knew which package it was). The PackagingGuide doesn't seem to explicitly say where it
comes from (although now I understand what it is I see the bit where it says debuild will sign one).

Something simple like changing the line:

If you're not sure what this means, you should <familiarise yourself with creating packages for Ubuntu.>

to

The sources.changes is generated by debuild as described in <the Ubuntu packaging guides.>

It's a minor change, but it would have made it clearer to me.

Dave