Materials:You'll need two different colors of yarn: color A and color B. You'll also need a crochet hook. In my sample swatch, I'm using baby pink yarn as color A, and baby blue yarn as color B.
Crochet two rows of single crochet in color A. When you get to the last stitch, stop short of completing the last step. (View A.)
Grab color B with your hook. (View B.)
Pull it through to complete the stitch. (View C.) Do not cut color A!
Work the turning chain with color B as you normally would. (View D.)