diff --git a/Doc/lib/libundoc.tex b/Doc/lib/libundoc.tex
index 52219cb302e..2967cb8d1d5 100644
--- a/Doc/lib/libundoc.tex
+++ b/Doc/lib/libundoc.tex
@@ -96,11 +96,11 @@ possibly using \envvar{PYTHONPATH}.
 --- alternate approach to packages
 
 \item[\module{cmp}]
---- File comparison function.  Use the newer \module{filecmp} instead.
+--- File comparison function.  Use the newer \refmodule{filecmp} instead.
 
 \item[\module{cmpcache}]
 --- Caching version of the obsolete \module{cmp} module.  Use the
-newer \module{filecmp} instead.
+newer \refmodule{filecmp} instead.
 
 \item[\module{codehack}]
 --- Extract function name or line number from a function