Well, remember, the enzyme places the substrate inside the active side and what that does is it creates a microenvironment and it basically decreases the space in which the reactants are colliding. And if the space is smaller, the collision between the reactants will be much more likely. And so enzymes can also actually increase A because they decrease the space in which the reactants are actually allowed to move. And so if the reactants basically collide more, the A value increases. So we see that enzymes predominantly affect the EA, but they can also affect A, they can decrease EA and increase A. And in both cases we basically increase the value of K. So enzymes affect the rate constant, they increase the rate constant.