diff --git a/greenctld b/greenctld
index 0141ab3..d9c40c9 100755
--- a/greenctld
+++ b/greenctld
@@ -8,6 +8,9 @@
 # The TCP network protocol is compatible with the hamlib rotctld protocol, which
 # gpredict speaks.
 #
+# Ported to Python 3. Simplified BSD License.
+# Copyright (C) 2022 Jeff Moe <moe@spacecruft.org>
+#
 # Copyright (c) 2017, Astro Digital, Inc.  Released under the terms of the
 # Simplified BSD License; see the LICENSE file for details.
 #