Is that all it says?? Is there a ** at the bottom of the page that tells you what it means, kind of like a footnote? Often in knitting patterns, there are a lot of asterix's used but they always have instructions in between them and are used to indicate a pattern repeat. That doesn't seem to be the case here though.
Were you also unsure about the 'Cast off 4 stitches, knit to end' part? If so, you will cast off 4 stitches at the beginning of the row (the same as bind-off, video can be found here), then work only knit stitches until you get to the end of the row.