DocuFeature.md

-This feature generates online documentation
+This feature generates online documentation. This documentation is available in two versions.
+
+ * /_api: A list of all registered handlers and the methods provided by them. Special annotations
+         can be used to augment/modify method descriptions. 
+          * `@Documentation`: prints an extra comment in front of the method signature.
+          * more?
+ * /_help: Prints an overview how to use the configured RequestHandler and the registered features. 
+          Also includes the API-section.
+          
+Documentation accepts content negotiation, i.e., by adding a `.txt` or setting the HTTP header `Accept: text/plain`
+you can force a plain text description.
+This, for example, makes the API description machine-readable.
 
 ## Maven