diff --git a/frontend/index.html b/frontend/index.html
index bd1e7f4..fde7b57 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -5,6 +5,10 @@
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>רשימת אורחים לחתונה</title>
+    <!-- Runtime config injected by the Docker entrypoint at container startup.
+         Populates window.ENV.VITE_API_URL from the VITE_API_URL env var.
+         MUST be loaded before the main bundle. -->
+    <script src="/config.js"></script>
   </head>
   <body dir="rtl">
     <div id="root"></div>
