Harmonic question

[Johan Vromans]

Hi,

I'm trying the TAB \harmonic feature of 2.12.

Am I right that to get a harmonic, you always need a chord?

E.g. This works: 

    <e''\harmonic>

but this doesn't:

    e''\harmonic

Modified from the docs:

    \relative c' {
      \new TabStaff {
        \new TabVoice {
          <c g'\harmonic> d\2\glissando e\2 e\harmonic
        }
      }
    }

-- Johan