That is, the entropy must either remain the same or it might increase. Okay? So we could represent this formula in another way, basically the same thing, except now we have this zero here, greater than or equal to zero. So the total entropy of the universe can never decrease. It must either remain the same or it must increase. What this also says is that the entropy of the system can decrease as long as there is a greater or equal increase in the entropy of the surrounding.