diff --git a/readme.md b/readme.md
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+++ b/readme.md
@@ -1,2 +1,6 @@
 # readme
+
 [开源与机器学习相关的Scratch插件](http://blog.just4fun.site/scratch-extension-knn)
+
+
+ref: [创建你的第一个Scratch3.0 Extension](https://blog.just4fun.site/create-first-Scratch3-Extension.html)