Where do I enter private grade school tuition paid using 529 plan funds in 2018?

In 2018, the tax law changed and you can use money withdrawn from a 529 plan to pay for K-12 private school tuition and for post secondary education.  I am wondering where I enter the K-12 tuition?  I have tried in the same area as you would enter post secondary education, but it just seems to be for college tuition.