I'm sure I've done this before, but I've never run into this instruction. This is in the instructions for the Blue Sky Brushed Suri Mitts. The complete line reads "Cast on 1 backward loop st over thumb area for 30 stitches total and complete round."
I've finished the thumb gusset, put the thumb opening stitches on a holder, and now this. Can anyone tell me how to do this?