Talk:cpp/chrono/duration/common type

Does the comment std::common_type<> is specialized for std::chrono::duration. belong in the main text or in a note? I was confused why common_type<> showed up for chrono::duration<> until I read the Standard and saw that there is a specialization.
 * Other specializations (i.e. swap, hash, etc, say this in the beginning of their main text. --Cubbi 05:46, 4 April 2013 (PDT)