Consistency: "unix" ==> "\UNIX{}"
diff --git a/Doc/lib/libmailcap.tex b/Doc/lib/libmailcap.tex
index c74b2e7..2cbffa1 100644
--- a/Doc/lib/libmailcap.tex
+++ b/Doc/lib/libmailcap.tex
@@ -15,7 +15,7 @@
The mailcap format is documented in RFC 1524, ``A User Agent
Configuration Mechanism For Multimedia Mail Format Information'', but
is not an Internet standard. However, mailcap files are supported on
-most Unix systems.
+most \UNIX{} systems.
\begin{funcdesc}{findmatch}{caps\, MIMEtype\, key\, filename\, plist}
Return a 2-tuple; the first element is a string containing the command