From 84bba19784026c65e548c7f33ab4f4406d043455 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@meta.com>
Date: Sat, 25 Apr 2026 09:49:30 -0700
Subject: [PATCH] doc: mention pigz and zlib in SEE ALSO

* gzip.1 (SEE ALSO): Add pigz(1).
Mention zlib as the library for programmatic gzip I/O.
Prompted by Bruno Haible in https://bugs.gnu.org/79794
---
 gzip.1 | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gzip.1 b/gzip.1
index 741cc31..e57bd1f 100644
--- a/gzip.1
+++ b/gzip.1
@@ -451,6 +451,7 @@ containing the following:
 .BR zmore (1),
 .BR zforce (1),
 .BR gzexe (1),
+.BR pigz (1),
 .BR zip (1),
 .BR unzip (1),
 .BR compress (1)
@@ -467,6 +468,13 @@ deflation format is specified in P. Deutsch, \s-1DEFLATE\s0 Compressed
 Data Format Specification version 1.3,
 .BR <https://www.ietf.org/rfc/rfc1951.txt> ,
 Internet RFC 1951 (May 1996).
+.PP
+The
+.B zlib
+compression library can be used to programmatically read and write
+gzip-format data.
+See
+.BR <https://zlib.net> .
 .SH "DIAGNOSTICS"
 Exit status is normally 0;
 if an error occurs, exit status is 1.
-- 
2.54.0