Footnote is not printed

[Павел]

Hello, I have problem with a footnote: it is not printer in the bottom 
of page.

\version "2.22.1"
\score {
    \header {
        piece = "My piece"
        opus = \markup\concat { "My opus" \footnote "*" \italic "* By me" }
    }
    { c' d' e' f' }
}