From Longman Dictionary of Contemporary Englishfootnotefoot‧note /ˈfʊtnəʊt $ -noʊt/ ●○○ noun [countable] 1 TCNa note at the bottom of the page in a book, which gives more information about something2 a piece of additional information that is not very important but is interesting or helps you understand somethingfootnote to There was an interesting footnote to the story.
Examples from the Corpus
footnote• Melville adds as a footnote that the oil from the whale is used in the most important ceremonies including most coronations.• It turns up as a footnote in every textbook and training manual.• This total dollar allowance is usually listed in a footnote to the balance sheet.• Carvey on film is mostly a footnote, a smudge, an embarrassment.• It was now that Popham Down wrote his footnote.• I don't see this affair as anything more than an interesting historical footnote.• We don't have any helpful little footnote explaining why.• A Maslow footnote sent me to the library to browse through books on the creative processes of mathematicians and scientists.• Many scores of pages are devoted to these topics and the general reader will need to keep a bookmark in the footnotes. 