diff --git a/mkdebian/debian/asfvolt16.preinst b/mkdebian/debian/asfvolt16.preinst
index 047e7fe..1237c87 100644
--- a/mkdebian/debian/asfvolt16.preinst
+++ b/mkdebian/debian/asfvolt16.preinst
@@ -1,5 +1,20 @@
 #!/bin/bash
 
+# Copyright 2018-present Open Networking Foundation
+#
+# This program 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/>.
+
 # kill CLI applications
 echo "kill running time application"
 [ -n "`pidof bcm_user_appl`" ] && killall bcm_user_appl
@@ -7,7 +22,7 @@
 [ -n "`pidof voltha_bal_driver`" ] && killall voltha_bal_driver
 # service bal_core_dist stop
 # service openolt stop
-[ -n "`pidof bal_core_dist`" ] && killall bal_core_dist 
+[ -n "`pidof bal_core_dist`" ] && killall bal_core_dist
 rm -f /var/run/bal_core_dist.pid
 [ -n "`pidof openolt`" ] && killall openolt
 rm -f /var/run/openolt.pid