Previously we focused on understanding the meaning behind the Michaela's methyl equation. And what we said was that the rate or the velocity at which the enzyme operates V naught is equal to the product of the maximum velocity, the maximum rate of the enzyme V max. And this ratio, so the numerator, is the substrate concentration and the denominator is M plus the substrate concentration. Now, previously we said that Km is known as the Michaelis constant. And we also said that the Michaelus constant has units of molarity. So the units of Km is the same as the units of the substrate concentration.