Heel Flap Pattern Help

I am using this pattern to knit my first sock.

I’m not sure what [B] Row 1: S11, Purl across[/B] and [B]Row 2: S11, K1 across[/B] means.

I’m sure I will need more help later in the pattern- but for now I’m stuck here.

Row 1 is Slip ONE, then purl across.(slip 1, then purl the rest of the row)

Row 2 is Slip ONE, knit one across. (slip one, knit one, slip one, knit one…

Those two rows are repeated across the 20 stitches.