1 files changed, 9 insertions, 0 deletions
diff --git a/examples/ymodem/null.c b/examples/ymodem/null.c
index c72ea064f8..640b8ba11b 100644
--- a/examples/ymodem/null.c
+++ b/examples/ymodem/null.c
@@ -1,3 +1,12 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
 #include <ymodem.h>
 
 static enum rym_code _rym_dummy_write(