diff --git a/reference/var/functions/serialize.xml b/reference/var/functions/serialize.xml
index f52b7ecca6..6cfe445f00 100644
--- a/reference/var/functions/serialize.xml
+++ b/reference/var/functions/serialize.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.9 $ -->
+<!-- $Revision: 1.10 $ -->
 <!-- splitted from ./en/functions/var.xml, last change in rev 1.28 -->
   <refentry id="function.serialize">
    <refnamediv>
@@ -38,18 +38,11 @@
    Likewise, when the object is restored using <function>unserialize</function>
    the <function>__wakeup</function> member function is called.
    </simpara>
-   <!-- TODO
-        in 4.0.4pl1 this didn't work properly, however, there
-        been some fixes. I don't know whether this all
-        works correctly now, and if so, whether it is since 405
-        or 406
    <note>
     <simpara>
-     This didn't work correctly until 4.0.?
+     This didn't work correctly until 4.0.7.
     </simpara>
    </note>
-   </simpara>
-   -->
    <note>
     <para>
      In PHP 3, object properties will be serialized, but methods are
@@ -59,6 +52,9 @@
      section of <link linkend="language.oop">Classes and
      Objects</link> for more information.
     </para>
+    <para>
+     It is not possible to serialize PHP built-in objects.
+    </para>
    </note>
     <para>
      <example>