Adding unicode to the list of core classes.
diff --git a/user_guide/general/core_classes.html b/user_guide/general/core_classes.html
index a750345..ac965ae 100644
--- a/user_guide/general/core_classes.html
+++ b/user_guide/general/core_classes.html
@@ -84,6 +84,7 @@
 <li>Log</li>
 <li>Output</li>
 <li>Router</li>
+<li>Unicode</li>
 <li>URI</li>
 </ul>