diff --git a/advancecomp.spec b/advancecomp.spec
index de1f9de..a71e053 100644
--- a/advancecomp.spec
+++ b/advancecomp.spec
@@ -3,6 +3,13 @@ Version:        2.1
 Release:        21%{?dist}
 Summary:        Recompression utilities for .png, .mng, .zip and .gz files
 
+# The bundled and forked 7z (7-Zip code) in 7z/ is under the “LGPL” license.
+# Based on https://www.7-zip.org/license.txt, and the absence of any mention of
+# license changes in https://www.7-zip.org/history.txt, 7-Zip has always been
+# licensed under LGPL-2.1-or-later, specifically; we thus assume this is the
+# intended specific license for the contents of the 7z/ directory. None of the
+# sources that would be covered by the “unRAR license restriction” or the
+# BSD-3-Clause license for LZFSE are present in this fork.
 License:        GPLv3
 URL:            https://www.advancemame.it/
 Source0:        https://github.com/amadvance/advancecomp/releases/download/v%{version}/advancecomp-%{version}.tar.gz
@@ -42,6 +49,24 @@ Provides:       bundled(zopfli) = 1.0.2%{?!el7:^20160527git6818a08}
 BuildRequires:  zopfli-devel
 %endif
 
+# From 7z/README:
+#
+#   This directory contains some source files from the
+#   7z archive utility. (www.7-zip.org)
+#
+#   All the files in this directory was originally released
+#   with the LGPL license.
+#
+#   All the modifications made on the original files must
+#   be considered Copyright (C) 2002 Andrea Mazzoleni and
+#   released under the LGPL license.
+#
+# It is not clear which version was forked. Because 7-Zip does not provide a
+# library, and because the implementation is modified, there is no possibility
+# of unbundling. Note that this was forked from the original 7-Zip, not from
+# p7zip.
+Provides:      bundled(7z)
+
 %description
 AdvanceCOMP contains recompression utilities for your .zip archives,
 .png images, .mng video clips and .gz files.
@@ -133,6 +158,7 @@ export LDFLAGS="-lzopfli ${LDFLAGS-}"
 - Unbundle libdeflate
 - Unbundle zopfli where it is available as a system library (i.e., Fedora)
 - Remove unnecessary BR on tofrodos
+- Properly document bundled 7z code
 
 * Mon Jul 27 2020 Jeff Law <law@redhat.com> - 2.1-15
 - Force C++14 as the code is not ready for C++17