diff --git a/index.html b/index.html
index a55f3b5..826e7ef 100644
--- a/index.html
+++ b/index.html
@@ -20,6 +20,7 @@ layout: default
 <ul>
 {% for post in paginator.posts %}
     <li itemscope itemtype="http://schema.org/BlogPosting"><a itemprop="url" href="{{ post.url }}"><span itemprop="dateModified">{{ post.date | date: "%Y-%m-%d" }}</span> - <span itemprop="name headline">{{ post.title }}</span></a>
+        <link itemprop="mainEntityOfPage" href="{{ site.url }}{{ post.url }}" />
         <meta itemprop="datePublished" content="{{ post.created | date: '%Y-%m-%d' }}" />
     {% if post.language == 'de' %}
         <img class="emoji" title="&#x3a;de&#x3a;" alt="&#x3a;de&#x3a;" src="https://assets-cdn.github.com/images/icons/emoji/de.png" width="20" height="20" align="absmiddle" />