First off let me say that after a long absence it was nice to pick up Civ5 and this mod and have a hoot of a time. This is a professional production worthy of much praise and so praise I give.
I play on standard or huge maps with only YNAEM as mods. When opening the diplomatic screen via the "button" in the top right another "button" is offered to open a more detailed view. In this view when mousing over city-state relations a TXT_CITYSTATE_HELP is seen, not the exact spelling but from memory my best shot.

Something that interests me, and if already answered elsewhere in the forum my apologises, would be a list of compatible widget mods ie. InfoAddict and whether the addition of City State Diplomacy mod would be possible without causing major work or headaches.
All that said a truly smooth production, kudos to the artwork as well!
Cheers!