diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 57ad5b2da8f5..e08669187d63 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -75,6 +75,8 @@ static void __init handle_initrd(void)
 	extern char *envp_init[];
 	int error;
 
+	pr_warn("using deprecated initrd support, will be removed in 2021.\n");
+
 	real_root_dev = new_encode_dev(ROOT_DEV);
 	create_dev("/dev/root.old", Root_RAM0);
 	/* mount initrd on rootfs' /root */