diff --git a/src/responder.h b/src/responder.h
index 37df828..1295cda 100644
--- a/src/responder.h
+++ b/src/responder.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #ifndef LIBPLDM_SRC_RESPONDER_H
 #define LIBPLDM_SRC_RESPONDER_H