diff --git a/src/documentation/xdocs/hdf/book.xml b/src/documentation/xdocs/hdf/book.xml
index 1b8facab3c..19f5697aa8 100644
--- a/src/documentation/xdocs/hdf/book.xml
+++ b/src/documentation/xdocs/hdf/book.xml
@@ -1,12 +1,14 @@
 <?xml version="1.0"?>
 <!DOCTYPE book PUBLIC "-//APACHE//DTD Cocoon Documentation Book V1.0//EN" "../dtd/book-cocoon-v10.dtd">
 
-<book software="Poi Project" 
-      title="HDF" 
+<book software="Poi Project"
+      title="HDF"
       copyright="@year@ Poi Project">
 
   <menu label="Navigation">
     <menu-item label="Main" href="../index.html"/>
+    <menu-item label="How-To" href="../how-to.html"/>
+    <menu-item label="HDF Format" href="../docoverview.html"/>
   </menu>
 
 </book>