diff --git a/index.html b/index.html
index 708f803..f8c4784 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en" prefix="og: http://ogp.me/ns/profile#">
   <head>
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
@@ -7,20 +7,31 @@
     <title>Daniel Kraus is (a) bovender</title>
     <meta name="author" content="Daniel Kraus (bovender)">
     <meta name="robots" content="index, follow">
-    <meta name="description" content="Daniel Kraus' personal homepage.">
+    <meta name="description" content="Daniel Kraus' personal homepage. Raised in Bovenden in Lower Saxony, Germany, Daniel is a Bovender.">
+    <meta name="keywords" content="Bovender, Bovenden, XL Toolbox">
     <link href="css/bootstrap.min.css" rel="stylesheet">
     <link href="css/bootstrap-theme.min.css" rel="stylesheet">
     <link href="css/bovender.css" rel="stylesheet">
+    <meta name="twitter:card" content="summary"></meta>
+    <meta name="twitter:site" content="@bovender_de"></meta>
+    <meta property="og:title" content="Daniel Kraus ia (a) Bovender">
+    <meta property="og:type" content="profile">
+    <meta property="og:url" content="https://www.bovender.de">
+    <meta property="og:image" content="https://www.bovender.de/img/gravatar.png">
+    <meta property="profile:first_name" content="Daniel">
+    <meta property="profile:last_name" content="Kraus">
+    <meta property="profile:username" content="bovender">
+    <meta property="profile:gender" content="male">
   </head>
   <body>
-    <div class="container" lang="en">
+    <div class="container">
       <div class="row">
         <div class="col-md-12">
           <h1>
             <img class="img-rounded pull-left gravatar" src="img/gravatar.png" alt="Daniel Kraus">
             Daniel Kraus is (a) Bovender
           </h1>
-          <ul class="nav nav-pills" role="navigation">
+          <ul class="nav nav-pills">
             <li>
               <a href="https://github.com/bovender">
                 GitHub
@@ -45,7 +56,7 @@
         </div>
       </div>
       <div class="row">
-        <div class="col-md-7">
+        <div class="col-md-7" lang="en">
           <div class="page-header">
             <h2>Basic Research</h2>
           </div>
@@ -208,7 +219,7 @@ sudo apt-get install create-changelog</code></pre>
             <a href="https://launchpad.net/~bovender/+archive/ubuntu/bovender">Ubuntu PPA</a>.
           </p>
         </div>
-        <div class="col-md-5">
+        <div class="col-md-5" lang="en">
           <img src="img/plesse.png" alt="The Plesse castle near Bovenden" title="The Plesse castle near Bovenden" class="img-responsive img-rounded center-block">
           <h3>Why Bovender?</h3>
           <p>
diff --git a/sitemap.xml b/sitemap.xml
new file mode 100644
index 0000000..1ee54d8
--- /dev/null
+++ b/sitemap.xml
@@ -0,0 +1,9 @@
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>https://www.bovender.de/</loc>
+    <lastmod>2019-12-21</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>1.0</priority>
+  </url>
+</urlset>
+
