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diff --git a/doc/refman/RefMan-ext.tex b/doc/refman/RefMan-ext.tex
index 7a56426c4..942530c3b 100644
--- a/doc/refman/RefMan-ext.tex
+++ b/doc/refman/RefMan-ext.tex
@@ -1750,16 +1750,20 @@ of the occurrences of {\Type}, use
\end{quote}
\comindex{Print Universes}
+\comindex{Print Sorted Universes}
The constraints on the internal level of the occurrences of {\Type}
(see Section~\ref{Sorts}) can be printed using the command
\begin{quote}
-{\tt Print Universes.}
+{\tt Print [Sorted] Universes.}
\end{quote}
+If the optional {\tt Sorted} option is given, each universe will be
+made equivalent to a numbered label reflecting its level (with a
+linear ordering) in the universe hierarchy.
This command also accepts an optional output filename:
\begin{quote}
-\tt Print Universes {\str}.
+\tt Print [Sorted] 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