[ESS] How to show R function argument hint?

[Stanley Chu]

Hi,

Does anyone know how to turn on the function to show R function arguments in the mini buffer?

Currently I am using (require 'ess-eldoc) to make this work. Just curious if anyone has different ways to do it. 

BTW, I am using Aquamacs 2.0 with ESS 5.8.

Thanks,
Stanley