Is there a way to alert user already registered?

-- HikaShop version -- : 3.3.0
-- Joomla version -- : 3.5.8
-- PHP version -- : 7

Hey Hikashop Family!

I have a issue where if a user is already registered it will not notify them that they already have a account. is there anyway to alert a user on registration screen that they already have a username/email already registered? Currently when they click register the screen just redirects right back to the register screen instead of just alerting them that they already have registered account.

Thanks,

Thanks a bunch Nicolas! Adding "<jdoc:include type="message" />" fixed the issue and now the messages are generating on registration.