wool - n - gather

Knit right loop is a left leaning single stitch increase. It's tidy and easy to make.

Knit up to the stitch you are increasing, with the right hand needle pick up the stitch on the row below inserting the needle from the back to the front, place it on the left hand needle and knit through the front loop.

If you find this increase leaves a hole, knit the lifted stitch through the back loop to twist the stitch and eliminate the gap.