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diff --git a/Doc/libmath.tex b/Doc/libmath.tex
index 765fcdf..935b940 100644
--- a/Doc/libmath.tex
+++ b/Doc/libmath.tex
@@ -1,4 +1,5 @@
\section{Built-in Module \sectcode{math}}
+\label{module-math}
\bimodindex{math}
\renewcommand{\indexsubitem}{(in module math)}
@@ -70,3 +71,7 @@ The module also defines two mathematical constants:
\else
\code{pi} and \code{e}.
\fi
+
+\begin{seealso}
+\seealso{cmath}{versions of these functions that can handle complex numbers}
+\end{seealso}