How do I add transaction description in email.

I'm using 3.0.2.0.
This is the current template,
Am I able to add the description for this transaction in the email template as well?

You have received $-15.20 credit!

Your total amount of credit is now $0.00.

Your account credit can deducted from your next purchase.

Do you use standard mail or one of mail services? There, in my opinion, there is a setting, and in standard mail, I'm not sure how this template will be displayed.

No idea what is going on. Getting our developer to do it.