So that's what that plus tells us. And so when x is greater than four, our f of x is equal to square root of x. So as we are approaching four from the right, we are really thinking about this part of the function. And so this is going to be equal to the square root of four. Even though right at four, our f of x is equal to this, we are approaching from values greater than four. We're approaching from the right. So we would use this part of our function definition.