mail theme commerce modify

Hello 

i want modify mail theme for commerce, 

when customer buy product from commerce he receive this mail,  but i want add some written and link 

need modify theme mail : Transaction Approved  ? 

or this mail theme is other ?

thanks 

Hi XXX,
Thank you for your order at Forum. Your payment has been received and approved.

— Forum

Order #2725

View Order

NEW description + new link