5 A capo indicator can be added with a fret-diagram-verbose
6 string, and its thickness can be changed.
11 \layout { ragged-right = ##t }
22 %% C major for guitar, with capo on third fret
25 \fret-diagram-verbose #'((mute 6)
33 %% C major for guitar, with capo on third fret
36 \override TextScript.fret-diagram-details.capo-thickness = #0.2
38 \fret-diagram-verbose #'((mute 6)