So if we look on the following y axis, this is the maximum velocity, this is the zero velocity. So the velocity in the middle is the v max divided by two. And if we draw that horizontal line and when that line touches that curve, we then draw a vertical line down that gives us the Y coordinate known as the Michael's constant Km. So basically the Mikala's constant Km describes the substrate concentration, the x value at which the rate, the velocity of that enzyme's activity is exactly half of its maximum velocity, v max. So if Km is equal to the substrate concentration, then V Naught is equal to v max divided by two. So that's the meaning behind Km.