diff --git a/reference/session/book.xml b/reference/session/book.xml
index b666262923..cdf0165caf 100644
--- a/reference/session/book.xml
+++ b/reference/session/book.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 <!-- Purpose: basic.session -->
 <!-- Membership: core -->
 
@@ -41,6 +41,7 @@
     <link linkend="function.serialize">serialize</link> your object 
     and <link linkend="function.unserialize">unserialize</link> it  
     afterwards.
+   </para>
   </caution>
   <para>
    All registered variables are serialized after the request