diff --git a/test/xdocs/properties.xml b/test/xdocs/properties.xml
index d18c116c..7fa21122 100644
--- a/test/xdocs/properties.xml
+++ b/test/xdocs/properties.xml
@@ -51,6 +51,7 @@
             can share a VM, so even if you set forkmode to "once", Ant may have
             to create more than a single Java VM. This attribute is ignored for
             tests that don't get forked into a new Java VM.
+            Defaults to <code>perTest</code>.
           </td>
         </tr>
         <tr>