From the Brioche Stitch website:
"This stitch turns the normal brioche yarn handling around. You yf sl1 knitwise instead of purlwise then yarn over and when you k2tog it is in the back of the loops. When you begin the RS rows you have to go behind the yarnover in order to get the stitch laying behind it so that you can knit it."
Yf= wyif
Shown with a cast-on count of 8 stitches.