diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c
index ce2a30b..516e255 100644
--- a/samples/bpf/syscall_nrs.c
+++ b/samples/bpf/syscall_nrs.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <uapi/linux/unistd.h>
 #include <linux/kbuild.h>