1) Add an explanation to 2) Add comments to a text 3) Do the write thing 4) Enter a flat 5) Get down 6) Jot down 7) Jot down for reference 8) Jot down in the margin 9) Jot in a log 10) Make jottings 11) Make marginal markings 12) Mark up 13) Mark up a score 14) Mark up with symbols 15) Mark up, musically Found on https://www.crosswordclues.com/clue/notate
No'tate adjective [ Latin notatus marked, past participle of notare to mark. See 5th Note .] (Botany) Marked with spots or lines, which are often colored. Henslow. Found on http://www.encyclo.co.uk/webster/N/35