K1,yo,K1 into st?

Does anyone know what this means? I Know what yo means, but the K1 into st has me a bit baffled. Thanks. Cdpete51

Knit into the stitch, leaving it on the left needle, then pull the yarn toward the front, knit into the same stitch again, this time pulling it off the left needle onto your right needle. You will have 3 sts where you only had one.