groff: ms Footnotes

 
 4.3.5.10 Footnotes
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 The 'ms' macro package has a flexible footnote system.  You can specify
 either numbered footnotes or symbolic footnotes (that is, using a marker
 such as a dagger symbol).
 
  -- String: \*[*]
      Specifies the location of a numbered footnote marker in the text.
 
  -- Macro: .FS
  -- Macro: .FE
      Specifies the text of the footnote.  The default action is to
      create a numbered footnote; you can create a symbolic footnote by
      specifying a "mark" glyph (such as '\[dg]' for the dagger glyph) in
      the body text and as an argument to the 'FS' macro, followed by the
      text of the footnote and the 'FE' macro.
 
    You can control how 'groff' prints footnote numbers by changing the
 value of the 'FF' register.  Seems Document Control Registers.
 
    Footnotes can be safely used within keeps and displays, but you
 should avoid using numbered footnotes within floating keeps.  You can
 set a second '\**' marker between a '\**' and its corresponding '.FS'
 entry; as long as each 'FS' macro occurs _after_ the corresponding '\**'
 and the occurrences of '.FS' are in the same order as the corresponding
 occurrences of '\**'.