Definition of footnotes:
(n) :
A short piece of text, often numbered, placed at the bottom of a printed page, that adds a comment, citation, reference etc, to a designated part of the main text.
(v) :
To add footnotes to a text.
(n) :
(by extension) An event of lesser importance than some larger event to which it is related.
(n) :
A qualification to the import of something.