Add a rough list of undocumented stuff at the end.
diff --git a/Doc/Makefile b/Doc/Makefile
index a244f9e..e1b2c36 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -113,7 +113,7 @@
     libxdrlib.tex libimghdr.tex \
     librestricted.tex librexec.tex libbastion.tex \
     libformatter.tex liboperator.tex libsoundex.tex libresource.tex \
-    libstat.tex libstrio.tex
+    libstat.tex libstrio.tex libundoc.tex
 
 # Library document
 lib.dvi: $(LIBFILES)