And in fact we're going to assume that this step, this reaction first reaction is at equilibrium before this reaction even begins. And we're going to assume that the concentration of this guy is very, very small. Now let's look at the second step. In the second step, notice that the reactant, this guy is the intermediate, this guy. So the product of step one is the reaction of step two and that means step two will be dependent on step one and that's because the intermediate is part of the reactive part of the slow step process. So the slow step is still the rate determining step and we're still going to use this step to find our rate law.