diff --git a/cactus/xdocs/properties.xml b/cactus/xdocs/properties.xml
index 1f26af6c..0972bb8f 100644
--- a/cactus/xdocs/properties.xml
+++ b/cactus/xdocs/properties.xml
@@ -129,6 +129,16 @@
             </p>
           </td>
         </tr>
+        <tr>
+          <td>cactus.runner</td>
+          <td>Yes</td>
+          <td>
+            <p>
+              The JUnit Runner to use for executing the tests. Valid values 
+              are "text" and "swing". Default value is <code>text</code>.
+            </p>
+          </td>
+        </tr>
       </table>
     </section>
   </body>