Add entry for copy_reg module.
diff --git a/Doc/lib.tex b/Doc/lib.tex
index 4483a2c..f1fd33e 100644
--- a/Doc/lib.tex
+++ b/Doc/lib.tex
@@ -76,6 +76,7 @@
 \input{liboperator}
 \input{libtraceback}
 \input{libpickle}
+\input{libcopyreg}
 \input{libshelve}
 \input{libcopy}
 \input{libmarshal}