diff --git a/templates/doc/api.html.ep b/templates/doc/api.html.ep
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+% layout 'main', title => 'KorAP: Application Programming Interface';
+
+<h2>Application Programming Interface</h2>
+
+<p>Internally the communication between the KorAP components is done using the <%= doc_link_to('KoralQuery', 'api', 'koralquery') %> protocol. The following endpoints make use of this protocol or establish additional mechanisms. All described endpoints are (more or lest) REST-ful web APIs.</p>
+
+<dl>
+  <dt><%= doc_link_to('Search API', 'api', 'search') %></dt>
+  <dd>Initiate queries, create virtual collections.</dd>
+
+  <dt><%= doc_link_to('Match API', 'api', 'match') %></dt>
+  <dd>Retrieve further information like annotations for a certain match.</dd>
+
+  <dt><%= doc_link_to('User API', 'api', 'user') %></dt>
+  <dd>Log in, log out, and set and retrieve user properties.</dd>
+</dl>