diff --git a/library/IPA_CodecPort.ttcn b/library/IPA_CodecPort.ttcn
index 9ba9d18..f9a242b 100644
--- a/library/IPA_CodecPort.ttcn
+++ b/library/IPA_CodecPort.ttcn
@@ -1,5 +1,16 @@
 module IPA_CodecPort {
 
+/* Simple IPA Codec Port, translating between raw TCP octetstring payload
+ * towards the IPL4asp port provider, and IPA primitives
+ * which carry the decoded IPA data types as payload.
+ *
+ * (C) 2017 by Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ */
+
 	import from IPL4asp_PortType all;
 	import from IPL4asp_Types all;
 	import from IPA_Types all;