diff --git a/index.html b/index.html
index a0ec2250f9..20be5306d4 100644
--- a/index.html
+++ b/index.html
@@ -25,6 +25,7 @@
     <head>
         <meta charset="utf-8">
         <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="description" content="A diff viewer.">
         <title>webrev</title>
         <link rel="stylesheet" href="style.css" />
         <link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />
