--- a/docs/api/libpreludedb-docs.xml
+++ b/docs/api/libpreludedb-docs.xml
@@ -26,10 +26,6 @@
     <xi:include href="xml/preludedb-sql-settings.xml"/>
 
   </chapter>
-  <chapter id="object-tree">
-    <title>Object Hierarchy</title>
-     <xi:include href="xml/tree_index.sgml"/>
-  </chapter>
   <index id="api-index-full">
     <title>API Index</title>
     <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>