How to add a label to the max value in R's ggplot2?

Question

how can I add a label to the max value of this plot:

qplot(c, data=subset(df,c < 3000),geom="freqpoly")

c is just integers

Answer 1

I think either annotate or geom_text is what you're looking for. http://stackoverflow.com/questions/2409357/how-to-nicely-annotate-a-ggplot2-manual