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-rw-r--r--Python/pywarpx/callbacks.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/Python/pywarpx/callbacks.py b/Python/pywarpx/callbacks.py
index 68629d164..3d5bb1477 100644
--- a/Python/pywarpx/callbacks.py
+++ b/Python/pywarpx/callbacks.py
@@ -1,3 +1,9 @@
+# Copyright 2017 David Grote
+#
+# This file is part of WarpX.
+#
+# License: BSD-3-Clause-LBNL
+
"""call back operations
=====================