diff --git a/frontend/index.html b/frontend/index.html
index ec0df5b..c457937 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -2,6 +2,7 @@
 <html lang="zh-Hant">
   <head>
     <meta charset="UTF-8" />
+    <script src="https://harbor-1wk.pages.dev/embed/maintenance.js" data-project="software-engineering-workshop"></script>
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="theme-color" content="#f1ecde" />
     <meta name="description" content="可以動手操作的軟體工程教材站。第一章：Git。" />
