diff --git a/lib_xua/src/core/endpoint0/chanstringgen.py b/lib_xua/src/core/endpoint0/chanstringgen.py
index c5343a03..49249f8a 100644
--- a/lib_xua/src/core/endpoint0/chanstringgen.py
+++ b/lib_xua/src/core/endpoint0/chanstringgen.py
@@ -1,3 +1,4 @@
+# Copyright (c) 2015-2018, XMOS Ltd, All rights reserved
 
 
 def genstrings(outputChanCount, chanString, portString, structureString, adc_dac):
diff --git a/tests/runtests.py b/tests/runtests.py
index 36198102..7d419e66 100755
--- a/tests/runtests.py
+++ b/tests/runtests.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python2.7
+# Copyright (c) 2018, XMOS Ltd, All rights reserved
 import xmostest
 import os.path
 
diff --git a/tests/test_i2s_loopback.py b/tests/test_i2s_loopback.py
index 06821bef..f56bdcf6 100644
--- a/tests/test_i2s_loopback.py
+++ b/tests/test_i2s_loopback.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# Copyright (c) 2018, XMOS Ltd, All rights reserved
 import xmostest
 
 def runtest_one_config(env, format, i2s_role, num_chans_in, num_chans_out, sample_rate):