|1||x or F||1st fretfr.||optionalopt.|
Guitar chords in the key of C major:
Chord Csus4 notes: C, F, G, C and (F). You should not play the 6th string.
The note F on the first string is not required, but can be played on the 1st fret if needed. The string 3 (G) is left open.
C suspended 4th chord's alternative names: Csus, Csus4.
1(C), 4(F), 5(G).