diff --git a/library/IuUP_Emulation.ttcn b/library/IuUP_Emulation.ttcn
index ec25e49..77cd739 100644
--- a/library/IuUP_Emulation.ttcn
+++ b/library/IuUP_Emulation.ttcn
@@ -1,5 +1,19 @@
 module IuUP_Emulation {
 
+/* IuUP emulation, uses the encoding/decoding from IuUP_Types.
+ *
+ * rather than running in a separate component with related primitives,
+ * we just implement a set of functions and data types which can be used
+ * by other code (such as an RTP endpoint) to implement IuUP support.
+ *
+ * (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 Osmocom_Types all;
 import from IuUP_Types all;