diff --git a/cmd/kubeadm/app/cmd/cmd.go b/cmd/kubeadm/app/cmd/cmd.go
index cf3481aac4d..97660a3b862 100644
--- a/cmd/kubeadm/app/cmd/cmd.go
+++ b/cmd/kubeadm/app/cmd/cmd.go
@@ -108,6 +108,6 @@ func NewKubeadmCommand(in io.Reader, out, err io.Writer) *cobra.Command {
 func AddKubeadmOtherFlags(flagSet *pflag.FlagSet, rootfsPath *string) {
 	flagSet.StringVar(
 		rootfsPath, "rootfs", *rootfsPath,
-		"The path to the 'real' host root filesystem.",
+		"[EXPERIMENTAL] The path to the 'real' host root filesystem.",
 	)
 }