** This version can be built for the Macintosh, but does not implement
all of the new display features described below. The port currently
-lacks unexec, asynchronous processes, and networking support.
+lacks unexec, asynchronous processes, and networking support. See the
+"Emacs and the Mac OS" appendix in the Emacs manual, for the
+description of aspects specific to the Mac.
\f
* Changes in Emacs 21.1