[boost] Refering to Boost.Build in print

Hi, In the months leading up to the publication of Dave's and Aleksey's TMP book, there was a discussion of the proper form for referring to Boost libraries in published material. I'm writing about Boost.Build, and I'm planning to refer to it as Boost.Build most of the time. My question is: if I refer to Boost.Build as "the Boost build system," is this a proper name or a description? How should it be capitalized? Jonathan