diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index cbd477c3..212aa673 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -1,5 +1,8 @@
 /*
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *
  *  Copyright (C) 2002-2020  The DOSBox Team
+ *  Copyright (C) 2019-2020  The dosbox-staging team
  *
  *  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
@@ -16,7 +19,6 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif