diff --git a/reference/session/book.xml b/reference/session/book.xml
index 1fb7151b1a..74b332c623 100644
--- a/reference/session/book.xml
+++ b/reference/session/book.xml
@@ -20,8 +20,8 @@
    user side or is propagated in the URL.
   </para>
   <para>
-   The session support allows you to register arbitrary numbers of
-   variables to be preserved across requests. When a visitor accesses
+   The session support allows you to store data between requests in the 
+   <varname>$_SESSION</varname> superglobal array. When a visitor accesses
    your site, PHP will check automatically (if <link 
    linkend="ini.session.auto-start">session.auto_start</link>
    is set to 1) or on your request (explicitly through
@@ -43,17 +43,15 @@
    </para>
   </caution>
   <para>
-   All registered variables are serialized after the request
-   finishes.  Registered variables which are undefined are marked as
-   being not defined.  On subsequent accesses, these are not defined
+   <varname>$_SESSION</varname> (and all registered variables) are serialized
+   after the request finishes.  Registered variables which are undefined are
+   marked as being not defined.  On subsequent accesses, these are not defined
    by the session module unless the user defines them later.
   </para>
   <warning>
    <para>
-    Some types of data can not be serialized thus stored in sessions. It
-    includes <type>resource</type> variables or objects with circular
-    references (i.e. objects which passes a reference to itself to another
-    object).
+    Because session data is serialized, <type>resource</type> variables cannot
+    be stored in the session.
    </para>
   </warning>
   <note>