diff --git a/language/predefined/exception/construct.xml b/language/predefined/exception/construct.xml
index b2194aad53..8a9247ba0f 100644
--- a/language/predefined/exception/construct.xml
+++ b/language/predefined/exception/construct.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 
 <refentry xml:id="exception.construct" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
@@ -11,9 +11,9 @@
   &reftitle.description;
   <constructorsynopsis>
    <modifier>public</modifier> <methodname>Exception::__construct</methodname>
-   <methodparam choice="opt"><type>string</type><parameter>message</parameter><initializer>NULL</initializer></methodparam>
+   <methodparam choice="opt"><type>string</type><parameter>message</parameter><initializer>""</initializer></methodparam>
    <methodparam choice="opt"><type>int</type><parameter>code</parameter><initializer>0</initializer></methodparam>
-   <methodparam choice="opt"><type>Exception</type><parameter>previous</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type>Exception</type><parameter>previous</parameter><initializer>NULL</initializer></methodparam>
   </constructorsynopsis>
   <para>
    Constructs the Exception.