diff --git a/contrib/zmq/zmq_sub.py b/contrib/zmq/zmq_sub.py
index 6268123dd8e53..3dea5e3c1440c 100755
--- a/contrib/zmq/zmq_sub.py
+++ b/contrib/zmq/zmq_sub.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env python2
+# Copyright (c) 2014-2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 import array
 import binascii