diff --git a/docs/en/unit/hall.md b/docs/en/unit/hall.md
index 857b10bc..4ccd0aa6 100644
--- a/docs/en/unit/hall.md
+++ b/docs/en/unit/hall.md
@@ -124,7 +124,7 @@
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5-unit/products/hall-effect-unit-a3144e';
 
 
    anchor_search(purchase_link);