Cannot navigate to my webpage without "www." what am I missing?

I made my first deployment with RoR, Heroku and GoDaddy hosting. I am able to navigate with "www.mypage.com" but I cant just go to "mypage.com". The page doesn't even load and there is no error message. Did I make a mistake in my deployment or is it something with the connection of GoDaddy and Heroku?