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diff --git a/doc/emacs/mark.texi b/doc/emacs/mark.texi
index d69bfef5ab3..84cf5b39638 100644
--- a/doc/emacs/mark.texi
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@@ -225,6 +225,16 @@ Save it in a buffer or a file (@pxref{Accumulating Text}).
If Delete Selection mode is enabled, some commands delete the region
when used while the mark is active. @xref{Mouse Commands}.
+ Some commands have a default behavior when the region is inactive,
+but operate on the text in the region if the region is active. For
+example, @kbd{M-$} (@code{ispell-word}) normally checks the spelling
+of the word at point, but it checks the text in the region if the
+region is active (@pxref{Spelling}). Normally, such commands use
+their default behavior if the region is empty (i.e., if mark and point
+are at the same position). If you want them to operate on the empty
+region, change the variable @code{use-empty-active-region} to
+@code{t}.
+
@node Mark Ring
@section The Mark Ring