diff --git a/Doc/lib/libzlib.tex b/Doc/lib/libzlib.tex
index 2e76900..f38a21c 100644
--- a/Doc/lib/libzlib.tex
+++ b/Doc/lib/libzlib.tex
@@ -6,9 +6,8 @@
 \bimodindex{zlib}
 
 For applications that require data compression, the functions in this
-module allow compression and decompression, using the zlib library,
-which is based on the GNU \program{gzip} program.  The zlib library
-has its own home page at
+module allow compression and decompression, using the zlib library.
+The zlib library has its own home page at
 \url{http://www.cdrom.com/pub/infozip/zlib/}.  Version 1.0.4 is the
 most recent version as of December, 1997; use a later version if one
 is available.
diff --git a/Doc/libzlib.tex b/Doc/libzlib.tex
index 2e76900..f38a21c 100644
--- a/Doc/libzlib.tex
+++ b/Doc/libzlib.tex
@@ -6,9 +6,8 @@
 \bimodindex{zlib}
 
 For applications that require data compression, the functions in this
-module allow compression and decompression, using the zlib library,
-which is based on the GNU \program{gzip} program.  The zlib library
-has its own home page at
+module allow compression and decompression, using the zlib library.
+The zlib library has its own home page at
 \url{http://www.cdrom.com/pub/infozip/zlib/}.  Version 1.0.4 is the
 most recent version as of December, 1997; use a later version if one
 is available.