Add new output mode - 'none'
diff --git a/org.jacoco.doc/docroot/doc/ant.html b/org.jacoco.doc/docroot/doc/ant.html
index c0e84e4..2eb8aa7 100644
--- a/org.jacoco.doc/docroot/doc/ant.html
+++ b/org.jacoco.doc/docroot/doc/ant.html
@@ -231,6 +231,7 @@
           <li><code>tcpclient</code>: At startup the agent connects to the TCP
               port specified by the <code>address</code> and <code>port</code>
               attribute. Execution data is written to this TCP connection.</li>
+          <li><code>none</code>: Do not produce any output.</li>
         </ul>
       </td>
       <td><code>file</code></td>