+This subsection describes two categories of commands which you can
+type without exiting the current incremental search, even though they
+are not themselves part of incremental search.
+
+@table @asis
+@item Prefix Arguments
+@vindex isearch-allow-prefix
+ In incremental search, when you enter a prefix argument
+(@pxref{Arguments}), by default it will apply either to the next
+action in the search or to the command that exits the search.
+
+ In previous versions of Emacs, entering a prefix argument always
+terminated the search. You can revert to this behavior by setting the
+variable @code{isearch-allow-prefix} to @code{nil}.
+
+ When @code{isearch-allow-scroll} is non-@code{nil} (see below),
+prefix arguments always have the default behavior described above.
+
+@item Scrolling Commands