Changing Variation Names

hey all, I was wondering what the process is for changing the name of a variation. I sell an item and we sell them in packs of 25 and packs of 100. When I created the item originally I was a newbie at creating variations and I created a variation name of 25 and 100 respectively. I would like to simply rename them to 25-pack and 100-pack. What is the best way to accomplish this task. when I hit the “edit” button I can change everything but the actual name of the variation. Thank in advance