Document DOT output of universe graph

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13612 85f007b7-540e-0410-9357-904b9bb8a0f7

2 files changed, 13 insertions, 1 deletions

diff --git a/CHANGES b/CHANGES
index 6f58e6c314..beb9ebab20 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,11 @@
 Changes from V8.3 to V8.4
 =========================
 
-New proof engine
+- New proof engine
+- When the output file of "Print Universes" ends in ".dot" or ".gv",
+  the universe graph is printed in the DOT language, and can be
+  processed by Graphviz tools.
+
 
 Changes from V8.2 to V8.3
 =========================
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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