diff --git a/include/net/psample.h b/include/net/psample.h
index 8888b0e..9b80f81 100644
--- a/include/net/psample.h
+++ b/include/net/psample.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __NET_PSAMPLE_H
 #define __NET_PSAMPLE_H