[css-backgrounds][Editorial] Color transition length in blurred shadows

In [1] there's a note that says: 
> Note this means for a long, straight shadow edge, the blur radius will create a visibly apparent color transition approximately the twice length of the blur radius that is perpendicular to and centered on the shadow's edge, and that ranges from almost the full shadow color at the endpoint inside the shadow to almost fully transparent at the endpoint outside it.

Shouldn’t this be “the length of the blur radius” instead of “twice the length of the blur radius”?

[1]: http://dev.w3.org/csswg/css-backgrounds/#shadow-blur

Lea Verou ✿ http://lea.verou.me ✿ @leaverou