diff --git a/1.hello-world/4.read-video-react/public/index.html b/1.hello-world/4.read-video-react/public/index.html
index 32c8cecc..8ab35107 100644
--- a/1.hello-world/4.read-video-react/public/index.html
+++ b/1.hello-world/4.read-video-react/public/index.html
@@ -9,6 +9,7 @@
     <meta name="description" content="Web site created using create-react-app" />
     <meta name="description" content="Read barcode with Dynamsoft Barcode Reader in a React Application.">
     <meta name="keywords" content="read barcode from camera in React">
+    <link rel="canonical" href="https://demo.dynamsoft.com/Samples/DBR/JS/1.hello-world/4.read-video-react/build/">
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <!--
       manifest.json provides metadata used when your web app is installed on a
@@ -42,4 +43,4 @@
     -->
 </body>
 
-</html>
\ No newline at end of file
+</html>