Definition of "Comment" :

noun: 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."

noun: a statement that expresses a personal opinion or belief or adds information

"From time to time she contributed a personal comment on his account."

noun: a report (often malicious) about the behavior of other people

verb: provide interlinear explanations for words or phrases

verb: explain or interpret something

verb: make or write a comment on

"He commented the paper of his colleague."