diff --git a/reference/mail/functions/mail.xml b/reference/mail/functions/mail.xml
index 67021eb9e5..7af2cbee8c 100644
--- a/reference/mail/functions/mail.xml
+++ b/reference/mail/functions/mail.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.10 $ -->
+<!-- $Revision: 1.11 $ -->
 <!-- splitted from ./en/functions/mail.xml, last change in rev 1.2 -->
   <refentry id="function.mail">
    <refnamediv>
@@ -115,7 +115,10 @@ mail("nobody@example.com", "the subject", $message,
     </para>
     <note>
      <para>
-      This fifth parameter was added in PHP 4.0.5.
+      This fifth parameter was added in PHP 4.0.5. Since PHP 4.2.3 this
+      parameter is disabled in <link linkend="ini.safe-mode">safe_mode</link>
+      and the <function>mail</function> function will expose a warning message
+      and return &false; if you're trying to use it.
      </para>
     </note>
     <para>