diff --git a/index.htm b/index.htm
index 9365557..27c657c 100644
--- a/index.htm
+++ b/index.htm
@@ -53,7 +53,7 @@
 <table>
   <thead>
     <tr>
-      <th><img src="https://liu673cn.github.io/mao/sub/Xbb/cat2.1.jpg" alt="cat2_1" /></th>
+      <th><img src="https://liu673cn.github.io/mao/sub/Xbb/cat2_1.jpg" alt="cat2_1" /></th>
       <th><img src="https://liu673cn.github.io/mao/sub/Xbb/cat2_2.jpg" alt="cat2_2" /></th>
     </tr>
   </thead>