That gives you the shortest possible chain. I prefer to use the little/little method that gives the length that will work with the largest sprocket that the RD can handle. The chain is routed through the RD and around the small ring and smallest or next to smallest sprocket. When the ends of the chain are joined, the RD cage should swing forward slightly and the chain should not hang loose. If you have the largest possible sprocket on your bike, then both methods will produce the same result.