question about minor + fourth

[Benjamin Poly]

Hi everyone,

I've recently started using lilypond and I like it very much but I find that the software has sometimes complex solutions to simple problems.

I want to display the chord notation "Am (add4)"
In chord mode I have tried
a:m.4 -> causes an error
a:m4 -> display a4 sus4 b3

Could somebody help me please ?

Best regards.

--
Benjamin Poly