[R] ggplot add a legend?

jcrosbie james at crosb.ie
Tue Dec 18 00:03:29 CET 2012

How to I go about adding a legend  to the following plot?

ggplot() +  geom_line(aes(x=df2010$Price,y=df2010$percentCapacity), colour =
+ geom_line(aes(x=df2011$Price,y=df2011$percentCapacity), colour = "green")
+geom_line(aes(x=df2012$Price,y=df2012$percentCapacity), colour = "blue") 


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