Repair missing spaces after \UNIX.
diff --git a/Doc/lib/libposixpath.tex b/Doc/lib/libposixpath.tex
index 851e459..7684fa0 100644
--- a/Doc/lib/libposixpath.tex
+++ b/Doc/lib/libposixpath.tex
@@ -58,7 +58,7 @@
\end{funcdesc}
\begin{funcdesc}{expanduser}{path}
-On \UNIX and Windows, return the argument with an initial component of
+On \UNIX{} and Windows, return the argument with an initial component of
\samp{\~} or \samp{\~\var{user}} replaced by that \var{user}'s home directory.
On \UNIX, an initial \samp{\~} is replaced by the environment variable