Hey
the brilliant new feature in my add-on area (Thanks a lot for that, it's really cool!) tells me there is new version of comment on invoice.
There is also a changelog for 2.2.0
https://www.webdesigner-profi.de/joomla-webdesign/shop/addons/comment-in-invoice.html?lang=de
But: no download option, the newest file is still 2.1.0
Thanks
Rolf