Watch the Arps. with Fingerpicking: 2 online guitar lesson by Muriel Anderson from 1-2-3 Fingerstyle Guitar
Here is a similar pattern, much like the one Merle Travis used in the second half of the song "Walkin' the Strings." We'll play it here on the same chord but using a forward roll instead of the backward roll in the previous exercise.
This is good practice to get the right hand fingers to do patterns in either direction.