diff --git a/README.md b/README.md
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new mode 100755
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--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 This SDK is for Kendryte K210 which contains FreeRTOS support.
 If you have any questions, please be free to contact us.
 
+[***warning***]This project is no longer maintained.Not recommended for product development.
+
 ## Usage
 
 If you want to start a new project, for instance, `hello_world`, you only need to:
@@ -49,4 +51,4 @@ You will get 2 key files, `hello_world` and `hello_world.bin`.
 
 This is very important, don't make a mistake in files.
 
-*If you don't like place code inside SDK, see `CMakeLists.txt.example.cmake`*
+*If you don't like place code inside SDK, see `CMakeLists.txt.example.cmake`*
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