diff --git a/include/linux/psi.h b/include/linux/psi.h
index 65eb1476ac705..a70ca833c6d77 100644
--- a/include/linux/psi.h
+++ b/include/linux/psi.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_PSI_H
 #define _LINUX_PSI_H
 
diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
index 0a23300d49af7..bf50068d5d4ba 100644
--- a/include/linux/psi_types.h
+++ b/include/linux/psi_types.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_PSI_TYPES_H
 #define _LINUX_PSI_TYPES_H
 
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 526af84ab852f..3397fa0011575 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Pressure stall information for CPU, memory and IO
  *