Add Fax to Confirmation Email

[timhersh]

I have checked the forum and I have tried to figure this out but I can't.

I need to add the fax number to the order confirmation email.

I have edited the order.php file where I thought it should be edited but it isn't working

if (SEND_EXTRA_ORDER_EMAILS_TO != '') {
$extra_info=email_collect_extra_info('','', $this->customer['firstname'] . ' ' . $this->customer['lastname'], $this->customer['email_address'], $this->customer['telephone'],$this->customer['fax']);
$html_msg['EXTRA_INFO'] = $extra_info['HTML'];


any ideas??