diff --git a/xen-stub.c b/xen-stub.c
index d403d86..9ea02d4 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -4,6 +4,8 @@
  * This work is licensed under the terms of the GNU GPL, version 2.  See
  * the COPYING file in the top-level directory.
  *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
  */
 
 #include "qemu-common.h"