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-rw-r--r--doc/refman/RefMan-ext.tex8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/refman/RefMan-ext.tex b/doc/refman/RefMan-ext.tex
index 206607911b..7a56426c40 100644
--- a/doc/refman/RefMan-ext.tex
+++ b/doc/refman/RefMan-ext.tex
@@ -1757,6 +1757,14 @@ The constraints on the internal level of the occurrences of {\Type}
{\tt Print Universes.}
\end{quote}
+This command also accepts an optional output filename:
+\begin{quote}
+\tt Print Universes {\str}.
+\end{quote}
+If {\str} ends in \texttt{.dot} or \texttt{.gv}, the constraints are
+printed in the DOT language, and can be processed by Graphviz
+tools. The format is unspecified if {\str} doesn't end in
+\texttt{.dot} or \texttt{.gv}.
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