Forbid any later GNU GPL versions autousage

diff --git a/doc/codecomm.txt b/doc/codecomm.txt
index ac63ca13347a8fabfb2ae199d0e8e0e7e7751b3e..6550a1692f750d682019e97f517afc297e697cb6 100644 (file)
--- a/doc/codecomm.txt
+++ b/doc/codecomm.txt
@@ -52,8 +52,7 @@ Copyright (C) 2017-2019 Sergey Matveev <stargrave@stargrave.org>
 
 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
-any later version.
+the Free Software Foundation, version 3 of the License.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of