footnote-section-tag

footnote-section-tag is a variable defined in `footnote.el'.
Its value is

"Footnotes: "

Documentation:
Tag inserted at beginning of footnote section.
If you set this to the empty string, no tag is inserted and the
value of `footnote-section-tag-regexp' is ignored. Customizing
this variable has no effect on buffers already displaying
footnotes.

You can customize this variable.