diff --git a/erpc_c/port/erpc_endianness_agnostic_example.h b/erpc_c/port/erpc_endianness_agnostic_example.h
index ce4daa89..fe41dafb 100644
--- a/erpc_c/port/erpc_endianness_agnostic_example.h
+++ b/erpc_c/port/erpc_endianness_agnostic_example.h
@@ -1,3 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
 /*
  * This is example file for endianness agnostic communication based on byteswap.h.
  * Other approach can be done with htons(), htonl(), ntohs(), ntohl() and such.
diff --git a/erpc_c/port/erpc_endianness_undefined.h b/erpc_c/port/erpc_endianness_undefined.h
index df35d48a..505243fb 100644
--- a/erpc_c/port/erpc_endianness_undefined.h
+++ b/erpc_c/port/erpc_endianness_undefined.h
@@ -1,3 +1,6 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
 
 #ifndef _ERPC_ENDIANNESS_UNDEFINED_H_
 #define _ERPC_ENDIANNESS_UNDEFINED_H_