diff --git a/audio/celt/Makefile b/audio/celt/Makefile
--- a/audio/celt/Makefile
+++ b/audio/celt/Makefile
@@ -12,6 +12,9 @@
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
+DEPRECATED=	Deprecated and considered obsolete by upstream in 2016 in favour of (lib)opus
+EXPIRATION_DATE=2021-12-31
+
 LIB_DEPENDS=	libogg.so:audio/libogg
 
 GNU_CONFIGURE=	yes