Consistently use \POSIX{} to denote POSIX. There were at least two different
ways to do it previously (not counting module names).
diff --git a/Doc/libtermios.tex b/Doc/libtermios.tex
index 1db8af8..afdd141 100644
--- a/Doc/libtermios.tex
+++ b/Doc/libtermios.tex
@@ -1,15 +1,15 @@
\section{Built-in Module \sectcode{termios}}
\label{module-termios}
\bimodindex{termios}
-\indexii{Posix}{I/O control}
+\indexii{\POSIX{}}{I/O control}
\indexii{tty}{I/O control}
\renewcommand{\indexsubitem}{(in module termios)}
-This module provides an interface to the Posix calls for tty I/O
-control. For a complete description of these calls, see the Posix or
+This module provides an interface to the \POSIX{} calls for tty I/O
+control. For a complete description of these calls, see the \POSIX{} or
\UNIX{} manual pages. It is only available for those \UNIX{} versions
-that support Posix \code{termios} style tty I/O control (and then
+that support \POSIX{} \code{termios} style tty I/O control (and then
only if configured at installation time).
All functions in this module take a file descriptor \var{fd} as their
@@ -94,13 +94,13 @@
%
\section{Standard Module \sectcode{TERMIOS}}
\stmodindex{TERMIOS}
-\indexii{Posix}{I/O control}
+\indexii{\POSIX{}}{I/O control}
\indexii{tty}{I/O control}
\renewcommand{\indexsubitem}{(in module TERMIOS)}
This module defines the symbolic constants required to use the
-\code{termios} module (see the previous section). See the Posix or
+\code{termios} module (see the previous section). See the \POSIX{} or
\UNIX{} manual pages (or the source) for a list of those constants.
\refbimodindex{termios}