lots of markup nits, most commonly Unix/unix --> \UNIX
diff --git a/Doc/mac/using.tex b/Doc/mac/using.tex
index bfa478e..b21a98e 100644
--- a/Doc/mac/using.tex
+++ b/Doc/mac/using.tex
@@ -6,7 +6,7 @@
features such as the IDE and the Package Manager that are worth pointing out.
Python on Mac OS 9 or earlier can be quite different from Python on
-Unix or Windows, but is beyond the scope of this manual, as that platform
+\UNIX{} or Windows, but is beyond the scope of this manual, as that platform
is no longer supported, starting with Python 2.4. See
\url{http://www.cwi.nl/\textasciitilde jack/macpython} for installers
for the latest 2.3 release for Mac OS 9 and related documentation.