Documentation.

h2/src/docsrc/html/roadmap.html

@@ -538,6 +538,8 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
     LOG=0, LOG=1, LOCK_MODE=0, disabling FILE_LOCK,...
 </li><li>Support for Thread.interrupt to cancel running statements.
 </li><li>Oracle compatibility: support INSERT ALL.
+</li><li>Support UDT (user defined types) similar to how Apache Derby supports it:
+    check constraint, allow to use it in Java functions as parameters (return values already seem to work).
 </li></ul>
 
 <h2>Not Planned</h2>