diff --git a/src/docbook/master.xml b/src/docbook/master.xml
index 5294dc30cf..0442b8ba5f 100644
--- a/src/docbook/master.xml
+++ b/src/docbook/master.xml
@@ -10,7 +10,7 @@
     <releaseinfo>
       <!-- The version.txt file is generated by maven-antrun-plugin. -->
       <xi:include href="../../target/version.txt" parse="text"
-                  xmlns:xi="http://www.w3.org/2001/XInclude" />
+                  xmlns:xi="http://www.w3.org/2001/XInclude"/>
     </releaseinfo>
   </bookinfo>
 
@@ -18,15 +18,15 @@
 
   <xi:include href="module/preface.xml"
               xmlns:xi="http://www.w3.org/2001/XInclude" />
-              
+
   <xi:include href="module/start.xml"
               xmlns:xi="http://www.w3.org/2001/XInclude" />
-  
-  <!-- The following chapters are not written yet.  -->
-  <!--
+
   <xi:include href="module/architecture.xml"
               xmlns:xi="http://www.w3.org/2001/XInclude" />
-              
+
+  <!-- The following chapters are not written yet.  -->
+  <!--
   <xi:include href="module/state-mgmt.xml"
               xmlns:xi="http://www.w3.org/2001/XInclude" />