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diff --git a/doc/emacs/search.texi b/doc/emacs/search.texi
index 2c1cefd9e0f..ce95f6da4f0 100644
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+++ b/doc/emacs/search.texi
@@ -300,6 +300,7 @@ search string. It uses the same text that @kbd{C-y} would yank.
@node Isearch Scroll
@subsection Scrolling During Incremental Search
+@vindex isearch-allow-scroll
You can enable the use of vertical scrolling during incremental
search (without exiting the search) by setting the customizable
variable @code{isearch-allow-scroll} to a non-@code{nil} value. This