diff --git a/dns/curvedns/Makefile b/dns/curvedns/Makefile
index 04842744cbf2..42fe6b988d71 100644
--- a/dns/curvedns/Makefile
+++ b/dns/curvedns/Makefile
@@ -7,6 +7,9 @@ MAINTAINER=	vsevolod@FreeBSD.org
 COMMENT=	Forwarder adding DNSCurve to an authoritative nameserver
 WWW=		https://curvedns.on2it.net/
 
+DEPRECATED=	Protocol never gained traction and is superseded by DoT and DoH
+EXPIRATION_DATE=2024-05-31
+
 LIB_DEPENDS=	libev.so:devel/libev \
 		libsodium.so:security/libsodium
 RUN_DEPENDS=	setuidgid:sysutils/daemontools