Update start.html

added note on endpoint requirements

Author: steffen-l

app/components/start/start.html

@@ -33,7 +33,8 @@ <h1>LD-VOWL</h1>
           <uib-alert  type="info" close="start.closeEndpointAlert()" style="margin-bottom: 0;">
             <span class="glyphicon glyphicon-info-sign" aria-hidden="true"></span>
             A list of endpoints can be found
-            <a class="alert-link" href="http://sparqles.ai.wu.ac.at/availability" target="_blank">here</a>.
+            <a class="alert-link" href="http://sparqles.ai.wu.ac.at/availability" target="_blank">here</a>.<br/>
+            <small>Endpoint requirements: 1) speaks SPARQL, 2) returns JSON, 3) allows CORS.</small>
           </uib-alert>
         </div>
       </div>