Add comments or explanations in the margin (8)

I believe the answer is:

annotate

(Other definitions for annotate that I've seen before include "Write down comments on" , "Provide interlinear or marginal comments in a book" , "Add explanatory comments" , "Make notes upon" , "Supply explanatory notes" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.