From 8ea823b353dec14b7bfedfa23385ad868463ec77 Mon Sep 17 00:00:00 2001
From: heister <heister@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 1 Mar 2013 18:46:59 +0000
Subject: [PATCH] update documentation and changes.h

git-svn-id: https://svn.dealii.org/trunk@28701 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/doc/news/changes.h            | 3 +++
 deal.II/include/deal.II/fe/fe_tools.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/deal.II/doc/news/changes.h b/deal.II/doc/news/changes.h
index 34e0cd0aa8..3faa53dc59 100644
--- a/deal.II/doc/news/changes.h
+++ b/deal.II/doc/news/changes.h
@@ -53,6 +53,9 @@ inconvenience this causes.
 
 <ol>
 
+<li> Fixed: FETools::interpolation_difference with PETSc.
+<br>
+(Timo Heister, 2013/02/16)
 
 </ol>
 
diff --git a/deal.II/include/deal.II/fe/fe_tools.h b/deal.II/include/deal.II/fe/fe_tools.h
index d0cb7482c6..ea93077ced 100644
--- a/deal.II/include/deal.II/fe/fe_tools.h
+++ b/deal.II/include/deal.II/fe/fe_tools.h
@@ -998,6 +998,9 @@ namespace FETools
    * elements on grids with hanging
    * nodes (locally refined grids)
    * are involved.
+   *
+   * For parallel computations with PETSc, supply @p z1 with ghost elements
+   * and @p z1_difference without ghost elements.
    */
   template <int dim, class InVector, class OutVector, int spacedim>
   void interpolation_difference(const DoFHandler<dim,spacedim> &dof1,
-- 
2.39.5