diff --git a/manual/xml/ardour_manual.xml b/manual/xml/ardour_manual.xml
index abbed68e2d..321804496d 100644
--- a/manual/xml/ardour_manual.xml
+++ b/manual/xml/ardour_manual.xml
@@ -51,6 +51,14 @@
   <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" 
 		href="glossary.xml" />
 
+<!--
+	This empty index element is used by the docbook xsl
+	as a marker for where to place an automatically generated
+	index.
+	-->
+
+  <index/>
+
   <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" 
 		href="contributing_to_the_manual.xml" />
 </book>