[Boost-users] [preprocessor] Documentation bug?

I'm confused... looking at the documentation for the "techniques" used in the preprocessor library (found at http://www.boost.org/libs/preprocessor/doc/topics/techniques.html), I see the following statements in the discussion of BOOST_PP_EMPTY : How: BOOST_PP_EMPTY() expands to nothing and can be used as an unused parameter. Note: BOOST_PP_EMPTY with the () never gets expanded. The () is necessary to invoke a function-like macro. The first statement suggests that BOOST_PP_EMPTY() is expanded. The second statement asserts that BOOST_PP_EMPTY with the () never gets expanded. (Perhaps the "with" here should be "without"?) Is this a conflict/bug in the documentation, or am I missing something? Thanks, Mike