diff --git a/README b/README
index 79f99f2..f143ede 100644
--- a/README
+++ b/README
@@ -1,3 +1,5 @@
 wlopm - Wayland output power management
 
 Simple client implementing zwlr-output-power-management-v1.
+
+wlopm is licensed under the GPLv3.
diff --git a/wlopm.c b/wlopm.c
index ca6ef34..d9a3fe1 100644
--- a/wlopm.c
+++ b/wlopm.c
@@ -4,9 +4,8 @@
  * Copyright (C) 2021 Leon Henrik Plickat
  *
  * 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
- * (at your option) any later version.
+ * it under the terms of the GNU General Public License version 3 as published
+ * by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of