You'll probably want some at some point.

This is a good deal http://smile.amazon.com/gp/aw/d/B003J7QXGQ/ref=mp_s_a_1_7?qid=1463347172&sr=8-7&pi=SL75_QL70&keywords=arkansas+sharpening+stone as it contains 3 Arkansas stone from a soft arkansas to a black stone. I have one and it works well