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diff --git a/doc/refman/RefMan-ltac.tex b/doc/refman/RefMan-ltac.tex
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+++ b/doc/refman/RefMan-ltac.tex
@@ -267,6 +267,12 @@ applied and $v_i$ is applied to the $i$-th generated subgoal by the
application of $v_0$, for $=1,...,n$. It fails if the application of
$v_0$ does not generate exactly $n$ subgoals.
+\variant If no tactic is given for the $i$-th generated subgoal, it
+behaves as if the tactic {\tt idtac} were given. For instance, {\tt
+split ; [ | auto ]} is a shortcut for
+{\tt split ; [ idtac | auto ]}.
+
+
\subsubsection{For loop}
\tacindex{do}
\index{Tacticals!do@{\tt do}}