Boxplot - Size of the labels

If we assume that I have produced the boxplot of the picture. How can I magnify the "mu=5" and "mu=6" ? I can't magnify them by modifing the fontsize in the figure properties. Any help could be useful. Thanks in advance!

Answer 1

[Thorsten]

 h = boxplot(rand(40,2))
 set(findobj(get(h(1), 'parent'), 'type', 'text'), 'fontsize', 30);