Repair missing spaces after \UNIX.
diff --git a/Doc/inst/inst.tex b/Doc/inst/inst.tex
index 6db22ac..adc686e 100644
--- a/Doc/inst/inst.tex
+++ b/Doc/inst/inst.tex
@@ -296,7 +296,7 @@
\filevar{prefix} and \filevar{exec-prefix} stand for the directories
that Python is installed to, and where it finds its libraries at
run-time. They are always the same under Windows, and very
-often the same under \UNIX and Mac OS X. You can find out what your Python
+often the same under \UNIX{} and Mac OS X. You can find out what your Python
installation uses for \filevar{prefix} and \filevar{exec-prefix} by
running Python in interactive mode and typing a few simple commands.
Under \UNIX, just type \code{python} at the shell prompt. Under