         registerPrefixes(forAutoCompletion: ["@", "#", "/", ":"])
     }
 
-    fileprivate func setupTitleView() {
+    private func setupTitleView() {
         let view = ChatTitleView.instantiateFromNib()
         self.navigationItem.titleView = view
         chatTitleView = view

        }
    }

    fileprivate func chatLogIsAtBottom() -> Bool {
        guard let collectionView = collectionView else { return false }

        let height = collectionView.bounds.height


    // MARK: Subscription

    private func markAsRead() {
        guard let subscription = subscription else { return }

        SubscriptionManager.markAsRead(subscription) { _ in
