From 51872777280ad7f06e2c0ebb069636e29afe41d9 Mon Sep 17 00:00:00 2001
From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Wed, 15 Dec 2010 15:31:39 +0000
Subject: [PATCH] Add to the documentation.

git-svn-id: https://svn.dealii.org/trunk@22967 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/include/deal.II/fe/mapping_q1.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/deal.II/include/deal.II/fe/mapping_q1.h b/deal.II/include/deal.II/fe/mapping_q1.h
index 9372ea6dbd..796570fb7b 100644
--- a/deal.II/include/deal.II/fe/mapping_q1.h
+++ b/deal.II/include/deal.II/fe/mapping_q1.h
@@ -228,6 +228,20 @@ class MappingQ1 : public Mapping<dim,spacedim>
 					  * boundary forms and normal
 					  * vectors.
 					  *
+					  * This vector has
+					  * (dim-1)*GeometryInfo<dim>::faces_per_cell
+					  * entries. The first
+					  * GeometryInfo<dim>::faces_per_cell
+					  * contain the vectors in the first
+					  * tangential direction for each
+					  * face; the second set of
+					  * GeometryInfo<dim>::faces_per_cell
+					  * entries contain the vectors in the
+					  * second tangential direction (only
+					  * in 3d, since there we have 2
+					  * tangential directions per face),
+					  * etc.
+					  *
 					  * Filled once.
 					  */
         std::vector<std::vector<Tensor<1,dim> > > unit_tangentials;
-- 
2.39.5