scholium

An explanatory note or commentary, as on a Greek or Latin text.

A note amplifying a proof or course of reasoning, as in mathematics.

A marginal note, annotation, or remark; an explanatory comment; specifically, an explanatory remark annexed to a Latin or Greek author by an early grammarian.

A marginal annotation; an explanatory remark or comment; specifically, an explanatory comment on the text of a classic author by an early grammarian.

A remark or observation subjoined to a demonstration or a train of reasoning.

a note added to a text as an explanation, criticism or commentary

a note added to a proof as amplification

a marginal note written by a scholiast (a commentator on ancient or classical literature)