And when we add Km, namely the two blue molecules, then the concentration of the enzyme substrate complex will be equal to exactly half of that initial. So four divided by two. And that gives us two. And that's what we mean by this equation here. Now, not only that, but what that also means is the rate of activity, the velocity of that enzyme will be exactly half of the maximum. And that makes sense because if half the enzymes have activides which are occupied, that means the rate will be exactly half of its maximum.