diff --git a/sbin/gbde/gbde.c b/sbin/gbde/gbde.c
index 421242c38c8..8f4c2b1fce5 100644
--- a/sbin/gbde/gbde.c
+++ b/sbin/gbde/gbde.c
@@ -737,6 +737,11 @@ main(int argc, char **argv)
 	struct g_bde_key *gl;
 	struct g_bde_softc sc;
 
+	fprintf(stderr, "GBDE disk-encryption is deprecated,\n");
+	fprintf(stderr, "and will be removed in FreeBSD 15.0\n");
+	fprintf(stderr, "(continuing in 5 seconds)\n");
+	sleep(5);
+
 	if (argc < 3)
 		usage();