diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
index 4a2037f..b5cdd3f 100644
--- a/arch/um/include/asm/irq.h
+++ b/arch/um/include/asm/irq.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __UM_IRQ_H
 #define __UM_IRQ_H