diff --git a/lib/syscall.c b/lib/syscall.c
index 2c6cd1b..1a7077f 100644
--- a/lib/syscall.c
+++ b/lib/syscall.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/ptrace.h>
 #include <linux/sched.h>
 #include <linux/sched/task_stack.h>