hidden lines and smart dimensions

Hello,

I want to add dimension of 8mm diameter to the inside of a revolved body with broken out section. Do I have unhide the inner line on the blind half part of the cylinder to make Smart Dimension stick? For unhiding the line I searched under View on the upper toolbar but no solution there. I attached my file and a picture of what I want to accomplish.

Thanks for your advice,

maurits

SolidworksDrawings And Detailing