Topic on Template talk:Extension

The field dedicated to Author is named Author(s) so it seems it is conceived to host more than one name. Unfortunately nowhere in the documentation is explained what the syntax is. Also, by looking at the code, I see no obvious way to do it. Anyone can explain how this should work? Thanks

When using "author" and "username" in combination you can only add one author. To circumvent this issue you only fill "author" like it was done with this diff on RecentActivity.