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.
supply with notes
a note placed below the text on a printed page
a printed note placed below the text on a printed page
add explanatory notes to or supply with critical comments; "The scholar annotated the early edition of a famous novel"
add explanatory notes to or supply with critical comments