groff: Footnotes and Annotations

 
 3.2.6 Footnotes and Annotations
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 There are a number of requests to save text for later printing.
 
    "Footnotes" are printed at the bottom of the current page.
 
    "Delayed text" is very similar to a footnote except that it is
 printed when called for explicitly.  This allows a list of references to
 appear (for example) at the end of each chapter, as is the convention in
 some disciplines.
 
    Most macro packages that supply this functionality also supply a
 means of automatically numbering either type of annotation.