Customize autoresponder email

Hi,

First of all, thank you so much for such a great plugin.
Can you just tell me can I customize the message when the user role changes?
Like If I set User role changed option to True in Autoresponder Email Manage.
And if I change the role of any user, he will get an email that says “User role changed!”
Can I customize the message, I mean can I add few more likes there, How can I do that. please answer.