diff --git a/fs/proc/root.c b/fs/proc/root.c
index 926fb27..4e42aba 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  *  linux/fs/proc/root.c
  *