[boost] Where does make_shared.hpp come from?

I stumbled over boost::make_shared() in Andrey's logging library. I checked the smart pointers documentation at http://www.boost.org/doc/libs/1_36_0/libs/smart_ptr/smart_ptr.htm but couldn't find any reference to boost::make_shared(). The header file make_shared.hpp contains the link http://www.boost.org/libs/smart_ptr/make_shared.html but the webpage doesn't exist either. Is boost::make_shared() not yet documented? Boris