So as we increase our substrate concentration, we see that the enzyme activity increases up to a certain value known as the maximum enzyme activity or maximum enzyme velocity. So we see that at a constant concentration of enzyme, the enzyme activity will continue to rise until a certain maximum value is reached, known as the maximum velocity. And the maximum velocity represents the condition in which all the active sites this should be active, not activate. So let's change that. So all the active sites so all the active sites are filled with appropriate substrate. So that basically represents the condition in which if, let's say, we have 1000 enzymes, each enzyme has one active site, if we have 1000 substrate molecules, then all the active sites will be filled.