[R] Overlay PDF on histogram

[James]

Hi,

I thought that I had read somewhere that there was a really simple  
way to overlay the probability density function of a normal  
distribution over a histogram, after the histogram has already been  
plotted.  Possibly a one word command.

I've found this email from the archives, but I don't think this is  
what I'm looking for.  I thought there was something more simple than  
the curve function.

http://tolstoy.newcastle.edu.au/R/help/05/04/3523.html

R> x <- rnorm(100)
R> hist(x, freq = FALSE)
R> curve(dnorm, col = 2, add = TRUE)

Is there a simple way to do this, or is my memory failing me?  Thank  
you.

James