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.