diff --git a/language/types/string.xml b/language/types/string.xml
index e4f475f136..3284e75301 100644
--- a/language/types/string.xml
+++ b/language/types/string.xml
@@ -1060,9 +1060,7 @@ bool(false)
   <para>
    Most PHP values can also be converted to <type>string</type>s for permanent
    storage. This method is called serialization, and is performed by the
-   <function>serialize</function> function. If the PHP engine was built with
-   <link linkend="ref.wddx">WDDX</link> support, PHP values can also be
-   serialized as well-formed XML text.
+   <function>serialize</function> function.
   </para>
 
  </sect2>