[boost] Boost.Threads inconsistency question

The Boost.Threads documentation states that the ScopedTimedLock concept is a refinement of the ScopedTryLock concept; however, the boost::timed_mutex::scoped_timed_lock class, which is supposed to be a model of the ScopedTimedLock concept, doesn't define the various try_* methods. In your opinion, should the documentation be changed to state that the ScopedTimedLock concept is a refinement of the ScopedLock (rather than ScopedTryLock) concept, or should the boost::timed_mutex::scoped_timed_lock class implement the various try_* methods? (FYI: a similar situation applies to boost::recursive_timed_mutex::scoped_timed_lock and boost::timed_read_write_mutex::scoped_timed_lock). Mike