[Boost-users] Find which boost header

Hi, I have trouble finding which header I should use when I want to use a part of boost. For instance, I wish to use boost::optional but am not entirely sure which header to use. In the documentation online I can find everything about boost::optional except which header is recommended. I'm sure it is boost/optional.hpp or boost/optional/optional.hpp but that's not really my question. Am I supposed to just browse through my local boost include dir to find an appropriate header? Or is there somewhere an overview of which header files are recommended for boost users? Thanks, Mathijs