Usage fix, problem reported by Keith Briggs.
diff --git a/Doc/lib/librlcompleter.tex b/Doc/lib/librlcompleter.tex
index aff18cd..8794ebb 100644
--- a/Doc/lib/librlcompleter.tex
+++ b/Doc/lib/librlcompleter.tex
@@ -10,7 +10,7 @@
the \refmodule{readline} module by completing valid Python identifiers
and keywords.
-This module is \UNIX-specific due to it's dependence on the
+This module is \UNIX-specific due to its dependence on the
\refmodule{readline} module.
The \module{rlcompleter} module defines the \class{Completer} class.