diff --git a/dsRag/static/tree.html b/dsRag/static/tree.html
index c2127277..fec3ec6e 100644
--- a/dsRag/static/tree.html
+++ b/dsRag/static/tree.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="zh">
 <head>
     <meta charset="UTF-8">
     <title>知识点树形展示</title>
