diff --git a/Doc/lib/libundoc.tex b/Doc/lib/libundoc.tex
index 5d1b3ca..4420468 100644
--- a/Doc/lib/libundoc.tex
+++ b/Doc/lib/libundoc.tex
@@ -220,14 +220,14 @@
 
 \item[tb.py]
 --- Print tracebacks, with a dump of local variables (use
-\function{pdb.pm()} or \module{traceback} instead)
+\function{pdb.pm()} or \refmodule{traceback} instead)
 
 \item[timingmodule]
 --- Measure time intervals to high resolution (use
 \function{time.clock()} instead).  (This is an extension module.)
 
 \item[whatsound.py]
---- recognizing sound files
+--- Recognize sound files; use \refmodule{sndhdr} instead.
 
 \item[zmod.py]
 --- Compute properties of mathematical "fields"