Add zlib
diff --git a/Doc/lib.tex b/Doc/lib.tex
index f9e23aa..4839415 100644
--- a/Doc/lib.tex
+++ b/Doc/lib.tex
@@ -121,6 +121,7 @@
 \input{libthread}
 \input{libanydbm}
 \input{libwhichdb}
+\input{libzlib}
 
 \input{libunix}			% UNIX Specific Services
 \input{libposix}