diff --git a/index.html b/index.html
index 96a5655..965960b 100644
--- a/index.html
+++ b/index.html
@@ -22,6 +22,7 @@
     <link rel="shortcut icon" href="assets/icon/favicon.ico" type="image/x-icon">
     <link rel="stylesheet" href="res/style/common.css">
     <link rel="stylesheet" href="res/style/aic-burst.css">
+    <link rel="preload" href="assets/svg/bg-state-unknow.svg" as="image">
     <script src="lib/jquery-3.7.1.min.js"></script>
     <script src="res/data/forums.js"></script>
     <script src="res/class/Icon.js"></script>