I think there's a tiny error in the article: With story counting, you use velocity in much the same way as usual, the only difference is that velocity is just

I think there's a tiny error in the article: With story counting, you use velocity in much the same way as usual, the only difference is that velocity is just a sum of stories rather than a sum of story points. I think it should be "count of stories" instead of "sum of stories", because you can't add stories as they aren't numbers.