Index: Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/IPiezoHeadCalculator.cs
===================================================================
diff -u -rc2fe76d04e1517a4e0aaf62184bccd413de0e472 -r89488cc05b12fd5720cd28a4eeeb001dc9b1456d
--- Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/IPiezoHeadCalculator.cs	(.../IPiezoHeadCalculator.cs)	(revision c2fe76d04e1517a4e0aaf62184bccd413de0e472)
+++ Ringtoets/Piping/src/Ringtoets.Piping.KernelWrapper/SubCalculator/IPiezoHeadCalculator.cs	(.../IPiezoHeadCalculator.cs)	(revision 89488cc05b12fd5720cd28a4eeeb001dc9b1456d)
@@ -1,7 +1,28 @@
-namespace Ringtoets.Piping.KernelWrapper.SubCalculator
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+namespace Ringtoets.Piping.KernelWrapper.SubCalculator
 {
     /// <summary>
-    /// Interface with operations for performing an piezometric head at exit sub calculation.
+    /// Interface with operations for performing a piezometric head at exit sub calculation.
     /// </summary>
     public interface IPiezoHeadCalculator
     {
@@ -26,7 +47,7 @@
         double PhiExit { get; }
 
         /// <summary>
-        /// Performs the piezomteric head at exit calculation.
+        /// Performs the piezometric head at exit calculation.
         /// </summary>
         void Calculate();
     }