maj13 is *not* a chord name, even though it seems like it is.
It is a description of which pitches to place in a chord.
What you will need to do is to add a chord name execption, as described in
the selected snippets of Notation Reference 2.7.2 Displaying chords.
You'll first need to know what
ok so i have this
chordset = \chordmode
{
\override ChordName #'font-size = #-1.0
r4 c4. r8 r8 r8 c8:maj13 r8 r4. d8:m7
}
and inside my choir staff i have
\new ChordNames \chordsett
how can i display the maj13 beside the chord C
note: this is for Chords Name only not for Chord notes
Eze