diff --git a/target/arm/helper.c b/target/arm/helper.c
index df4276f5f6..d3f3cb57d5 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1,3 +1,10 @@
+/*
+ * ARM generic helpers.
+ *
+ * This code is licensed under the GNU GPL v2 or later.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
 #include "qemu/osdep.h"
 #include "qemu/units.h"
 #include "target/arm/idau.h"