noun
footnote
A note at the bottom of a page, used in academic or formal writing.
この論文では、重要な補足情報をフットノートで示している。
In this paper, important supplementary information is given in footnotes.
脚注 is the native Japanese term for footnote, more common in formal contexts. フットノート is a direct loanword and may sound slightly more casual or technical.
Loanword from English 'footnote'.