diff --git a/arch/um/include/asm/irqflags.h b/arch/um/include/asm/irqflags.h
index 3bb221e..cbc6c00 100644
--- a/arch/um/include/asm/irqflags.h
+++ b/arch/um/include/asm/irqflags.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __UM_IRQFLAGS_H
 #define __UM_IRQFLAGS_H