diff --git a/shells/ksh2020/Makefile b/shells/ksh2020/Makefile
index 0b027d2e1bad..e4859480b2a4 100644
--- a/shells/ksh2020/Makefile
+++ b/shells/ksh2020/Makefile
@@ -1,47 +1,50 @@
 PORTNAME=	ksh2020
 PORTVERSION=	2020
 PORTREVISION=	1
 CATEGORIES=	shells
 
 MAINTAINER=	cy@FreeBSD.org
-COMMENT=	Development branch of AT&T KornShell 93
+COMMENT=	Archived development branch of AT&T KornShell 93
 WWW=		http://www.kornshell.com/
 
 LICENSE=	EPL
 
+DEPRECATED=	Upstream ksh2020 branch archived, development continues under new ksh93 project
+EXPIRATION_DATE=	2022-09-30
+
 USES=		compiler:c11 meson ninja python:build
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	att
 GH_PROJECT=	ast
 GH_TAGNAME=	ksh2020
 
 KSH_CONFLICTS=		pdksh
 KSH93_CONFLICTS=	ksh93 ksh93-devel ast-ksh
 
 MESON_BUILD_DIR=	build
 
 OPTIONS_DEFAULT=	KSH93
 OPTIONS_SINGLE=		BIN_KSH
 OPTIONS_SINGLE_BIN_KSH=	KSH KSH93
 KSH_DESC=		Install to ${PREFIX}/bin/ksh
 KSH93_DESC=		Install to ${PREFIX}/bin/ksh93
 
 KSH93_EXTRA_PATCHES=	${FILESDIR}/extra-patch-install-as-ksh93 \
 			${FILESDIR}/extra-patch-install-as-ksh93-doc
 
 KSH_PLIST_SUB=		93=""
 KSH93_PLIST_SUB=	93="93"
 
 .include <bsd.port.options.mk>
 
 post-patch:
 	@${REINPLACE_CMD} -e '/for name in/ s|python.*|${PYTHON_CMD}|g' ${WRKSRC}/scripts/python.sh
 	@${REINPLACE_CMD} -e 's|SF_FLAGS|SFIO_FLAGS|g' ${WRKSRC}/src/lib/libast/include/sfio*.h ${WRKSRC}/src/lib/libast/sfio/*.c
 .if ${PORT_OPTIONS:MKSH93}
 	@${MV} ${WRKSRC}/src/cmd/ksh93/docs/ksh.1 ${WRKSRC}/src/cmd/ksh93/docs/ksh93.1
 .endif
 .if ${PORT_OPTIONS:MKSH}
 .endif
 
 .include <bsd.port.mk>