Watch the Study 4: Rock Groove online guitar lesson by TrueFire from Rock Guitar Greatest Hits Vol. 1
Lesson Source: Carl Verheyen's S.W.A.T. Improvisation
Just having that F# available to me in bars 3 and 4 (over the D7 chord) opens so many options for interesting lines. I don't need to abandon my A minor pentatonic blues material, I simply want to add to it.