commentary

ot noun

1. (usually in the plural) a brief account of transactions or events written hastily, as if for a memorandum Caesar's Commentaries on the Gallic War
2. An oral relation of an event, especially broadcast by television or radio, as it occurs We listened to the football commentary while watching the match.
3. A series of comments or annotations; especially, a book of explanations or expositions on the whole or a part of some other work