comment

a statement that expresses a personal opinion or belief or adds information; "from time to time she contributed a personal comment on his account"

a written explanation or criticism or illustration that is added to a book or other textual material; "he wrote an extended comment on the proposal"

a report (often malicious) about the behavior of other people; "the divorce caused much gossip"

make or write a comment on; "he commented the paper of his colleague"

explain or interpret something

provide interlinear explanations for words or phrases; "He annotated on what his teacher had written"