foot·note 
/ˈfʊtˌnoʊt/ noun
plural foot·notes /ˈfʊtˌnoʊt/ noun [count] 1 : a note with added information that is placed below the text on a printed page 2 : someone or something that is remembered or regarded as a minor or unimportant part of an event, work, etc.
▪ a movement now regarded as a footnote to history
▪ a movement now regarded as a footnote to history
— foot·not·ed /ˈfʊtˌnoʊtəd/ adjective
▪ The book is heavily footnoted. [=the book includes many footnotes]
/ˈfʊtˌnoʊtəd/ adjective ▪ The book is heavily footnoted. [=the book includes many footnotes]
