diff --git a/docs/zh_CN/unit/mic.md b/docs/zh_CN/unit/mic.md
index d2eea9df..58cd8ac2 100644
--- a/docs/zh_CN/unit/mic.md
+++ b/docs/zh_CN/unit/mic.md
@@ -116,7 +116,7 @@
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5-unit/products/microphone-unit-lm393';
 
    anchor_search(purchase_link);
    scrollFunc();