From 2c829280034c18353cd3959d97fbc690e8c8d88c Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@ulg.ac.be>
Date: Fri, 6 Mar 2015 12:00:25 +0000
Subject: [PATCH]
---
doc/texinfo/gmsh.texi | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/doc/texinfo/gmsh.texi b/doc/texinfo/gmsh.texi
index df17a16e93..f6ae6cba80 100644
--- a/doc/texinfo/gmsh.texi
+++ b/doc/texinfo/gmsh.texi
@@ -2854,10 +2854,12 @@ the mesh of the surface.
Force mesh of lines on the left-hand side (slaves) to match the mesh of
the lines on the right-hand side (masters).
-@item Periodic Surface @var{expression} @{ @var{expression-list} @} = @var{expression} @{ @var{expression-list} @};
+@item Periodic Surface @var{expression} @{ @var{expression-list} @} = @var{expression} @{ @var{expression-list} @} < Using @{ @var{expression-list} @} >;
Force mesh of the surface on the left-hand side (slave, with boundary
edges specified between braces) to match the mesh of the surface on the
-right-hand side (master, with boundary edges specified between braces).
+right-hand side (master, with boundary edges specified between braces). The
+optional @code{Using} list specifies an explicit affine transform (as a 4 x 4
+matrix given by row).
@item Coherence Mesh;
Removes all duplicate mesh vertices.
--
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