So when we're right around here along that x axis, now, what can we assume when we basically state the following statement? So when the concentration of our substrate is much smaller than Km, this is the assumption that we can make. So let's take a look at the following equation. So this equation is telling us that the total amount of enzyme inside our cell, inside that environment is equal to the sum of the free enzyme that is not bound to any substrate plus the enzyme that is bound to that substrate. Now, we know that when the concentration of the substrate is very low, when we're right here, the rate of the enzyme will be low because not much of the substrate will actually be bound to the enzyme. And so that means our E total is equal to approximately the concentration of the free enzyme.