\footnotetext

Synopsis, one of:

\footnotetext{text}
\footnotetext[number]{text}

Place text at the bottom of the page as a footnote. It pairs with \footnotemark (see \footnotemark) and can come anywhere after that command, but must appear in outer paragraph mode (see Modes). The optional argument number changes the number of the footnote mark.

See \footnotemark and Footnotes in a table, for usage examples.