Mistake rib stitch

What is/how do you do the mistake rib stitch? I’ve seen items made with it and seen references to it but I don’t know how to do it. How is it different from a 2k2p rib? Thanks!

In my Vogue Knitting it says…

Mistake-stitch ribbing

Multiple of 4 sts + 3 extra

Row 1: *K2, p2; rep from *, end K2, P1.
Rep this row

So basically you end up with a column of stockinette, column of seed stitch, and column of reverse stockinette.