Add a missing copyright note.

diff --git a/source/numerics/kdtree.cc b/source/numerics/kdtree.cc
index 45b23a4fd641e553a1bd70d70648f00bef03206b..90232cedd741620082b1d191dd57aab9a25f944b 100644 (file)
--- a/source/numerics/kdtree.cc
+++ b/source/numerics/kdtree.cc
@@ -1,3 +1,18 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2017 - 2018 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
 #include <deal.II/numerics/kdtree.h>
 
 #ifdef DEAL_II_WITH_NANOFLANN