attach a tooltip to the object with the text "Follow me!" always facing the player

public void SetToolTip(VRTK_InteractableObject obj, string text)
{
    var tip = obj.GetComponentInChildren<VRTK_ObjectTooltip>();
    if (tip == null)
    {
        tip = obj.gameObject.AddComponent<VRTK_ObjectTooltip>();
    }
    tip.displayText = text;
    tip.textAlignment = TextAlignmentOptions.Center;
    tip.alwaysFaceHeadset = true;
    tip.useTipsMesh = true;
}