diff --git a/reference/mail/functions/mail.xml b/reference/mail/functions/mail.xml
index 11364eea0d..6aef194243 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: 1.14 $ -->
+<!-- $Revision: 1.15 $ -->
 <!-- splitted from ./en/functions/mail.xml, last change in rev 1.2 -->
   <refentry id="function.mail">
    <refnamediv>
@@ -99,7 +99,8 @@ mail("nobody@example.com", "the subject", $message,
      can be used to pass an additional parameter to the program configured
      to use when sending mail using the <literal>sendmail_path</literal>
      configuration setting. For example, this can be used to set the
-     envelope sender address when using sendmail. You may need to add
+     envelope sender address when using sendmail with the
+     <literal>-f</literal> sendmail option. You may need to add
      the user that your web server runs as to your sendmail configuration
      to prevent a 'X-Warning' header from being added to the message when
      you set the envelope sender using this method.