noun, noun or participle which takes 'suru', transitive verb, intransitive verb
annotation; explanatory note; commentary
Refers to explanatory notes added to a text, document, or statement. Can be used as a noun or as a suru-verb meaning 'to annotate' or 'to add a note'.
この本には詳しい注釈がついている。
This book has detailed annotations.
He added a comment to that statement.