diff --git a/reference/classobj/functions/get-object-vars.xml b/reference/classobj/functions/get-object-vars.xml
index ac18b4298a..479d3c8f50 100644
--- a/reference/classobj/functions/get-object-vars.xml
+++ b/reference/classobj/functions/get-object-vars.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/classobj.xml, last change in rev 1.1 -->
   <refentry id="function.get-object-vars">
    <refnamediv>
@@ -14,10 +14,18 @@
      </methodsynopsis>
     <para>
      This function returns an associative array of defined object properties 
-     for the specified object <parameter>obj</parameter>. If variables
-     declared in the class of which the <parameter>obj</parameter> is an
-     instance, have not been assigned a value, those will not be returned 
-     in the array.
+     for the specified object <parameter>obj</parameter>.
+    </para>
+    <note>
+     <para>
+      In versions prior to PHP 4.2.0, if the variables declared in the class 
+      of which the <parameter>obj</parameter> is an instance, have not been 
+      assigned a value, those will not be returned in the array.  In versions
+      after PHP 4.2.0, the key will be assigned with a <constant>NULL</constant> 
+      value.
+     </para>
+    </note>
+    <para>
      <example>
       <title>Use of <function>get_object_vars</function></title>
       <programlisting role="php">
@@ -61,6 +69,7 @@ print_r(get_object_vars($p1));
  (
      [x] => 1.233
      [y] => 3.445
+     [label] =>
  )
 
  Array