Footnotes in section headings (LaTeX2e unofficial reference manual (November 2018))

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### 11.4 Footnotes in section headings

Putting a footnote in a section heading, as in:

    \section{Full sets\protect\footnote{This material due to ...}}

causes the footnote to appear at the bottom of the page where the section starts, as usual, but also at the bottom of the table of contents, where it is not likely to be desired. The simplest way to have it not appear on the table of contents is to use the optional argument to `\section`

    \section[Please]{Please\footnote{%
      Don't footnote in chapter and section headers!}}

No `\protect` is needed in front of `\footnote` here because what gets moved to the table of contents is the optional argument.

Unofficial LaTeX2e reference manual