cannot change the font size in legend

[Francesco Potortì]

Is this a bug or it's me?

octave> plot(1:2)
octave> legend({"aa"}, 'fontsize', 10)
warning: legend: specifying location with a numeric argument is obsolete and 
will be removed from a future version of Octave, use a string specification 
instead
warning: called from
    legend at line 211 column 7
error: legend: invalid location specified
error: called from
    legend at line 218 column 9

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