commentary

Plural: commentaries

Noun

• a written explanation or criticism or illustration that is added to a book or other textual material
• A series of comments or annotations; especially, a book of explanations or expositions on the whole or a part of some other work.
• A brief account of transactions or events written hastily, as if for a memorandum.
• An oral relation of an event, especially broadcast by television or radio, as it occurs.

Examples

• Caesar's Commentaries on the Gallic War
• We listened to the football commentary while watching the match.

Synonyms

comment, scholia, secondary source