Percentage coupons: exclude shipping

Percentage coupons (10% off, for example) operate on the overall value of the order, including the shipping cost, and probably the order fee as well (I don't have any). Is there a setting to specify to exclude these total order modules from the coupon, or do I have to hack the code?

Admin> Modules> Order Total> Discount Coupons - Disable Apply to Shipping

Doh, it was too obvious, how did I missed that? :ohmy::blush: Sorry for the noise (but at least, it makes something to search in the forum...). :D
I searched in the global settings and in the coupon generation section... That's one problem with Zen Cart: incredibly flexible, but sometime it gets hard to find where a setting is hidden. :-)

Thank you for the quick answer!

Phil-

We are aware the Admin has some usability problems :) It is scheduled for a complete rebuild in the future.