Consistency: "unix" ==> "\UNIX{}"
diff --git a/Doc/librotor.tex b/Doc/librotor.tex
index a3431fc..4999c81 100644
--- a/Doc/librotor.tex
+++ b/Doc/librotor.tex
@@ -99,8 +99,7 @@
a truly skilful and determined attacker to break the cipher. So if you want
to keep the NSA out of your files, this rotor cipher may well be unsafe, but
for discouraging casual snooping through your files, it will probably be
-just fine, and may be somewhat safer than using the Unix \file{crypt}
+just fine, and may be somewhat safer than using the \UNIX{} \file{crypt}
command.
\index{National Security Agency}\index{crypt(1)}
% XXX How were Unix commands represented in the docs?
-