diff --git a/index.xml b/index.xml
index f18340509..fbc448747 100644
--- a/index.xml
+++ b/index.xml
@@ -4,6 +4,7 @@
   %general-entities;
 ]>
 <book>
+<!-- Another test -->
 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="prologue/bookinfo.xml"/>
 <!--
 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="prologue/dedication.xml"/>