Add Product Description to Confirmation email

Please advise as to what file(s) need to be changed, in order to include (add) the PRODUCT Description to the CONFIRMATION Email sent to the customer upon clicking CONFIRM Order on the Checkout page.

Frankly, this is something that should be available in the core files. For example when using opencart for product downloads and/or food ordering, it is almost a necessity to include a product / item description so a customer can't come back later and claim this is NOT what they ordered.

ANY help is appreciated.
FX Designer
OpenCart 1.5.1.3

catalog/controller/checkout/order.php
catalog/view/theme/default/template/mail/order.tpl

could you please let me know which code i have to edit for add product description to confirmation email?