diff --git a/docs/en/unit/mic.md b/docs/en/unit/mic.md
index b208966d..f83eb5ef 100644
--- a/docs/en/unit/mic.md
+++ b/docs/en/unit/mic.md
@@ -119,7 +119,7 @@ To get complete code, please click [here](https://github.com/m5stack/M5-ProductE
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5-unit/products/microphone-unit-lm393';
 
    anchor_search(purchase_link);
    scrollFunc();