Adding new information to confirmation emails

I need to add a new line/information to the confirmation email. These are being sent in text.

I have changed the checkout_process.php to add the text
define('EMAIL_TEXT_PIN_NUMBER', 'Pin Number:');

and changed the class- order.php and added this line:

$html_msg['PIN_NUMBER'] = EMAIL_TEXT_PIN_NUMBER.' xxxxxx';

(the x's are for testing purposes)

right before the comments part of the message on line 925. But nothing shows up in the email.

Have I missed a step?

The $html_msg variable is only used for the HTML-formatted emails. You'll have to also update the other variable being assembled for text-only content.

that makes sense (duh, what was I thinking?) I now see references interspersed throughout labeled $email_order

In v2.0 you'll be able to do both text-and-html formats in the same line of code ... so that's something to look forward to ;)

You keep saying that! So when? I'm doing lots of sites right now - I don't mind upgrading but all these new clients are going to get really ticked when the new version comes out next month or something. Is there anything I can do to help?