--- a/modbus/modbus.py	Fri Jun 15 16:41:55 2018 +0300
+++ b/modbus/modbus.py	Mon Jun 18 12:12:57 2018 +0300
@@ -8,7 +8,7 @@
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
+# the Free Software Foundation, either version 2 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,