diff --git a/index.xml b/index.xml
index fbc448747..edc374f79 100644
--- a/index.xml
+++ b/index.xml
@@ -5,6 +5,7 @@
 ]>
 <book>
 <!-- Another test -->
+<!-- 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"/>