From c2092851a1ed692220618b968f25db3e7807d5c6 Mon Sep 17 00:00:00 2001
From: Luca Heltai <luca.heltai@sissa.it>
Date: Sat, 9 Apr 2016 14:48:24 +0200
Subject: [PATCH] Added comment and entry to changes.h.

---
 doc/news/changes.h          | 14 ++++++++++++++
 source/grid/manifold_lib.cc |  4 +++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/doc/news/changes.h b/doc/news/changes.h
index eb6858df67..c9b229c73b 100644
--- a/doc/news/changes.h
+++ b/doc/news/changes.h
@@ -38,6 +38,13 @@ inconvenience this causes.
 </p>
 
 <ol>
+  <li> Changed: FlatManifold takes as argument a periodicity option. This
+  used to be a Point<dim>, but it should have been a Tensor<1,dim>. This
+  is now changed.
+  <br>
+  (Luca Heltai, 2016/04/09)
+  </li>
+
   <li> Changed: The default nodal point distribution of FE_Q, FE_DGQ,
   FE_Q_DG0, FE_Q_Bubbles, and FE_TraceQ has been changed from equidistant
   points to the node points of the corresponding Gauss-Lobatto quadrature
@@ -108,6 +115,13 @@ inconvenience this causes.
  (Luca Heltai, Wolfgang Bangerth, 2016/04/08)
  </li>
 
+ <li> New: Added CompositionManifold to create new manifolds from two
+ ChartManifold objects. This can be used, for example, to rotate a
+ cylindrical Manifold, or to make a cylinders with parabolic sides.
+ <br>
+ (Luca Heltai, 2016/04/09)
+ </li>
+
  <li> New: Added GridGenerator::torus() to generate the volume mesh of a
  torus in three dimensions and a manifold description TorusManifold to
  go with it.
diff --git a/source/grid/manifold_lib.cc b/source/grid/manifold_lib.cc
index 16ab8980c7..dd95f0a80c 100644
--- a/source/grid/manifold_lib.cc
+++ b/source/grid/manifold_lib.cc
@@ -36,7 +36,9 @@ Tensor<1,spacedim>
 SphericalManifold<dim,spacedim>::get_periodicity()
 {
   Tensor<1,spacedim> periodicity;
-  periodicity[spacedim-1] = 2*numbers::PI; // theta and phi period.
+  // In two dimensions, theta is periodic. In three dimensions the variable
+  // that is periodic is phi. We have no periodicity in theta in 3d.
+  periodicity[spacedim-1] = 2*numbers::PI;
   return periodicity;
 }
 
-- 
2.39.5