diff --git a/awviz_common/include/awviz_common/transformation/transformation_manager.hpp b/awviz_common/include/awviz_common/transformation/transformation_manager.hpp
index 3d76aff..4b350e5 100644
--- a/awviz_common/include/awviz_common/transformation/transformation_manager.hpp
+++ b/awviz_common/include/awviz_common/transformation/transformation_manager.hpp
@@ -90,7 +90,7 @@ class TransformationManager
   std::unique_ptr<TfTree> tf_tree_;                          //!< TfTree unique pointer.
   std::shared_ptr<std::unordered_map<std::string, std::string>>
     entities_;  //!< Map stores a entity path of a corresponding frame ID.
-  std::unordered_map<std::string, double> last_log_stamps_;
+  std::unordered_map<std::string, double> last_log_stamps_;  //!< Map stores last log timestamps.
 };
 }  // namespace awviz_common
 #endif  // AWVIZ_COMMON__TRANSFORMATION_MANAGER_HPP_
diff --git a/awviz_common/include/awviz_common/visualization_manager.hpp b/awviz_common/include/awviz_common/visualization_manager.hpp
index 7b8e018..99595c2 100644
--- a/awviz_common/include/awviz_common/visualization_manager.hpp
+++ b/awviz_common/include/awviz_common/visualization_manager.hpp
@@ -59,8 +59,6 @@ class VisualizationManager
   rclcpp::CallbackGroup::SharedPtr parallel_callback_group_;  //!< Parallel callback group.
   rclcpp::TimerBase::SharedPtr callback_timer_;               //!< Timer callback.
 
-  std::mutex display_mutex_;
-
 private:
   /**
    * @brief Parse topics and create new ROS subscriptions every time.