optional note

[Maarten]

Hi,

I'm writing choral music for organ.
One of my chords is bigger than 1 octave, more specific it is <b g,>
My fingers are just long enough to play this chord, but I can imagine that 
others cannot. That's why I want to insert an extra optional note g (that is 1 
octave higher). I use separate voices for tenor (the b) and bass (the g and g,).

How can I mark the higher g as optional?

Suggestions:
- (g), that is: put round brackets around the g note head;
- only set the higher g in a smaller fontsize and keep the lower g, in the 
original font size

Is one of these suggestions possible? Or could it be done otherwise?

Thanks,

Maarten