1\version "2.21.0"
2\header {
3    texidoc = "The prefix of additional chord pitches can be tuned with
4@code{additionalPitchPrefix}."
5}
6
7\new ChordNames {
8    <c e g d'>	% add9
9    \set additionalPitchPrefix = "add"
10    <c e g d'>	% add9
11}
12