diff --git a/index.html b/index.html
index 3c8bef0..35eafe6 100644
--- a/index.html
+++ b/index.html
@@ -1,11 +1,26 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
+  <meta charset="UTF-8"><!-- charset meta element should be the first thing in <head> -->
+
   <title>Uno game JS</title>
+
+  <!-- The HTML <meta> Element -->
+  <meta name="description" content="UNO game in JavaScript DEMO">
+  <meta name="keywords" content="UNO, Game, JavaScript">
+  <meta name="author" content="Eunchong Kim">
+
+  <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
+
+  <!-- Setting The Viewport -->
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+  <!-- JS -->
   <script src='js/uno_game.js'></script>
 </head>
 <body>
 
+  <!-- UNO game div -->
   <div id='uno-game'></div>
 
 </body>
