diff --git a/src/transport/af-mctp.c b/src/transport/af-mctp.c
index 34454b3..bf024b8 100644
--- a/src/transport/af-mctp.c
+++ b/src/transport/af-mctp.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #include "mctp-defines.h"
 #include "base.h"
 #include "container-of.h"
diff --git a/src/transport/container-of.h b/src/transport/container-of.h
index facefe5..4c6ce1b 100644
--- a/src/transport/container-of.h
+++ b/src/transport/container-of.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #ifndef CONTAINER_OF_H
 #define CONTAINER_OF_H
 
diff --git a/src/transport/mctp-demux.c b/src/transport/mctp-demux.c
index 8b35c0a..a874cef 100644
--- a/src/transport/mctp-demux.c
+++ b/src/transport/mctp-demux.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #include "mctp-defines.h"
 #include "base.h"
 #include "container-of.h"
diff --git a/src/transport/socket.c b/src/transport/socket.c
index 8c5dd01..4498356 100644
--- a/src/transport/socket.c
+++ b/src/transport/socket.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #include "socket.h"
 
 #include <errno.h>
diff --git a/src/transport/socket.h b/src/transport/socket.h
index 17751ca..09c697a 100644
--- a/src/transport/socket.h
+++ b/src/transport/socket.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #ifndef LIBPLDM_SRC_TRANSPORT_SOCKET_H
 #define LIBPLDM_SRC_TRANSPORT_SOCKET_H
 
diff --git a/src/transport/test.c b/src/transport/test.c
index 730d8e6..2a929cc 100644
--- a/src/transport/test.c
+++ b/src/transport/test.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 /* NOLINTNEXTLINE(bugprone-reserved-identifier,cert-dcl37-c,cert-dcl51-cpp) */
 #define _GNU_SOURCE
 #include "array.h"
diff --git a/src/transport/transport.c b/src/transport/transport.c
index 12a26aa..bc01000 100644
--- a/src/transport/transport.c
+++ b/src/transport/transport.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #include "libpldm/transport.h"
 #include "libpldm/base.h"
 #include "libpldm/requester/pldm.h"
diff --git a/src/transport/transport.h b/src/transport/transport.h
index f052785..81d7b61 100644
--- a/src/transport/transport.h
+++ b/src/transport/transport.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 #ifndef LIBPLDM_SRC_TRANSPORT_TRANSPORT_H
 #define LIBPLDM_SRC_TRANSPORT_TRANSPORT_H