ACT-420 Automatic upgrade

distro/src/readme.html

@@ -46,6 +46,11 @@
   
   <h3>Release Notes - Activiti - Version 5.1</h3>
   
+  <h4>Warning</h4>
+  <p>The automatic upgrade does not have enough coverage to have full confidence.
+  For more info, see <a href="docs/userguide/index.html#databaseUpgrade">the user guide, section Database upgrade</a>.
+  </p>
+  
   <h4>Changes</h4>
   <ul>
     <li>In attribute &lt;serviceTask delegateExpression="..."&gt; previously always performed a leave after