noun
A note or comment added to a text, often explanatory or supplementary. Used in academic, editorial, or formal writing.
この論文には詳細な付注がついている。
This paper has detailed annotations.
編集者が原稿に付注を加えた。
The editor added comments to the manuscript.
Compound of 付 (attach) and 注 (note, comment). The spelling 附注 uses the older form 附 for 付, and 註 is the older form of 注. The word is straightforwardly derived from its components.