diff --git a/docs/index.md b/docs/index.md
index 32f96a76..199aa34b 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -324,7 +324,7 @@
 </div>
 
 <div class="item">
-  <a href="/#/en/base/pm2.5">
+  <a href="/#/en/base/PM2.5">
     <img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/m5-docs_homepage/base/base_pm25_01.jpg">
   </a>
   <p class="item-title" style="font-style:italic;">PM2.5</p>