Comment 7 for bug 262661

Mentioning it in the changelog is OK (even though you have to explicitly say that it is added to the original tarball which is then repacked) but you forgot to mention it in the REQUIRED file, which is debian/copyright; also you should have marked the original tarball so that it was easily recognised as NOT the same as the one distributed from upstream.
Having said that, please attach here a copy of your current diff.gz (since there is none in the uploaded package, please also add a watch and/or get-orig-source rule in this new version).