Another rudiment within the drag family is called a single drag tap.
Now if you know what a drag is, you're talking about a rudiment in which your main stick is up in the air, and your other stick is down towards the snare, and you're dragging the grace not stick into the accent, whether it's open or closed. This involves playing a drag, but has a tap following it.
Now what you're going to do is you're going to do a normal drag, but you're going to tap on the opposite side of your body, so that when you do that, it reverses where the next setup, the next drag is going to be. And much like a single drag, you can play it open with your grace note being doubled before the accent, or you can play it closed with the grace note being, being buzzed before the accent. I'll play it open with the single drag tap so you can hear how it sounds, slow and moving up a little faster. Same rudiment, but this time closed where you're buzzing the grace note a little bit more.
So just remember a single drag tap is going to evolve a tap note after your standard single drag, and it's tapped on the opposite side of your body to set up for the next round of drags that you're going to do.