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diff --git a/doc/refman/RefMan-tac.tex b/doc/refman/RefMan-tac.tex
index 40954f83ed..6f1f8a13c4 100644
--- a/doc/refman/RefMan-tac.tex
+++ b/doc/refman/RefMan-tac.tex
@@ -989,6 +989,15 @@ Assumptions} (see Section~\ref{PrintAssumptions}). Admitted subgoals
have names of the form {\ident}\texttt{\_admitted} possibly followed
by a number.
+\subsection{\tt constr\_eq \term$_1$ \term$_2$
+\tacindex{constr\_eq}
+\label{constreq}}
+
+This tactic applies to any goal. It checks whether its arguments are
+equal modulo alpha conversion and casts.
+
+\ErrMsg \errindex{Not equal}
+
\subsection{\tt is\_evar \term
\tacindex{is\_evar}
\label{isevar}}