So v one half corresponds to the velocity or the rate of activity of the enzyme when exactly half of the active sites of all the enzymes are basically occupied by our substrate. So the point at which exactly half of the enzyme active sites are being used up or are being occupied is given by a constant given by Km known as the Mikhailis constant. At this point, the velocity is given by v one half. Now, we're going to discuss this in much more detail when we get into biochemistry, but at this point I simply want to mention the filing for an idea about this Maca Lis constant. So the Michael is constant. Km does not actually depend on the concentration.