"Add" Chords

Very frustrating not to be able to use "add", ie. Cadd9. In the case of Traveling Willbury's Handle with Care, I had to designate D/C instead of the actual chord Cadd9. And, there is no way to annotate this because there is no comments section attached to an edit. As good as your features are I would think it wouldn't be that hard to include an "add" option.