diff --git a/Doc/Makefile b/Doc/Makefile
index bf2491c2a81..3edd6b686d0 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -115,7 +115,7 @@ LIBFILES = lib.tex \
     libformatter.tex liboperator.tex libsoundex.tex libresource.tex \
     libstat.tex libstrio.tex libundoc.tex libmailcap.tex libglob.tex \
     libuser.tex libanydbm.tex librandom.tex libsite.tex libwhichdb.tex \
-    libbase64.tex libfnmatch.tex libquopri.tex
+    libbase64.tex libfnmatch.tex libquopri.tex libzlib.tex
 
 # Library document
 lib.dvi: $(LIBFILES)
diff --git a/Doc/lib.tex b/Doc/lib.tex
index f9e23aa9ec6..4839415a018 100644
--- a/Doc/lib.tex
+++ b/Doc/lib.tex
@@ -121,6 +121,7 @@ to Python and how to embed it in other applications.
 \input{libthread}
 \input{libanydbm}
 \input{libwhichdb}
+\input{libzlib}
 
 \input{libunix}			% UNIX Specific Services
 \input{libposix}
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index f9e23aa9ec6..4839415a018 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -121,6 +121,7 @@ to Python and how to embed it in other applications.
 \input{libthread}
 \input{libanydbm}
 \input{libwhichdb}
+\input{libzlib}
 
 \input{libunix}			% UNIX Specific Services
 \input{libposix}
diff --git a/Doc/lib/libsomeos.tex b/Doc/lib/libsomeos.tex
index 49c1ab2c3e4..c04cf7a9a37 100644
--- a/Doc/lib/libsomeos.tex
+++ b/Doc/lib/libsomeos.tex
@@ -22,7 +22,14 @@ interfaces but they are available on some other systems as well
 
 \item[anydbm]
 --- Generic interface to DBM-style database modules.
+
 \item[whichdbm]
 --- Guess which DBM-style module created a given database.
 
+\item[zlib]
+\item[gzip]
+--- Compression and decompression compatible with the
+\code{gzip} program (zlib is the low-level interface, gzip the
+high-level one).
+
 \end{description}
diff --git a/Doc/libsomeos.tex b/Doc/libsomeos.tex
index 49c1ab2c3e4..c04cf7a9a37 100644
--- a/Doc/libsomeos.tex
+++ b/Doc/libsomeos.tex
@@ -22,7 +22,14 @@ interfaces but they are available on some other systems as well
 
 \item[anydbm]
 --- Generic interface to DBM-style database modules.
+
 \item[whichdbm]
 --- Guess which DBM-style module created a given database.
 
+\item[zlib]
+\item[gzip]
+--- Compression and decompression compatible with the
+\code{gzip} program (zlib is the low-level interface, gzip the
+high-level one).
+
 \end{description}