diff --git a/reference/mbstring/functions/mb-send-mail.xml b/reference/mbstring/functions/mb-send-mail.xml
index deba98f81e..78e4f2c84e 100644
--- a/reference/mbstring/functions/mb-send-mail.xml
+++ b/reference/mbstring/functions/mb-send-mail.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <!-- splitted from ./en/functions/mbstring.xml, last change in rev 1.19 -->
   <refentry id="function.mb-send-mail">
    <refnamediv>
@@ -43,6 +43,14 @@
      headers.  Multiple extra headers are separated with a
      newline ("\n").
     </para>
+    <note>
+     <para>
+      <literal>Content-Type</literal> and
+      <literal>Content-Transfer-Encoding</literal> headers can be redefined as
+      of PHP 5.0.0. In PHP 4, values defined by
+      <function>mb_language</function> are always used.
+     </para>
+    </note>
     <para>
      <parameter>additional_parameter</parameter> is a MTA command line
      parameter. It is useful when setting the correct Return-Path