diff --git a/update-dns.sh b/update-dns.sh
index ecfbd63..7d25b41 100755
--- a/update-dns.sh
+++ b/update-dns.sh
@@ -1,4 +1,31 @@
 #! /usr/bin/env bash
+# 2014, Moritz Kaspar Rudert (mortzu) <mr@planetcyborg.de>.
+# All rights reserved.
+
+# Redistribution and use in source and binary forms, with or without modification, are
+# permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this list of
+#   conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright notice, this list
+#   of conditions and the following disclaimer in the documentation and/or other materials
+#   provided with the distribution.
+#
+# * The names of its contributors may not be used to endorse or promote products derived
+#   from this software without specific prior written permission.
+#
+# * Feel free to send Club Mate to support the work.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
+# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
+# AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
 
 # PID file
 PID_FILE="/run/ffhb-update-dns.pid"
@@ -60,7 +87,7 @@ while true; do
 done
 
 # generate forward zone
-if zonegen.py < "$TMP_FILE" > "${ZONEFILE}.new"; then
+if zonegen.py <"$TMP_FILE" >"${ZONEFILE}.new"; then
   mv "${ZONEFILE}.new" "${ZONEFILE}"
 fi