That's all there is to it. But you run the risk of throwing the beer out of balance and turning a good thing into high-alcohol plonk. Occasionally, I've added some sugar to dry out a beer that had too many fermented sugars at the end.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk