footnote
noun
[ ˈfʊtnəʊt ]
• an additional piece of information printed at the bottom of a page.
Similar:
note,
marginal note,
annotation,
comment,
gloss,
aside,
incidental remark,
digression,
parenthesis,
notation,
marginalia,
commentary,
scholium,
footnote
verb
• add a footnote or footnotes to (a piece of writing).