diff --git a/src/play_controller.cpp b/src/play_controller.cpp
index d928f94d3f5..a4e6df5496b 100644
--- a/src/play_controller.cpp
+++ b/src/play_controller.cpp
@@ -652,9 +652,8 @@ config play_controller::to_config() const
 		sound::write_music_play_list(cfg);
 	}
 
-		//TODO: move id_manager handling to play_controller
 	cfg["next_underlying_unit_id"] = str_cast(n_unit::id_manager::instance().get_save_id());
-
+	//TODO: i am not sure whether the next line is needed.
 	cfg.merge_attributes(saved_game_.classification().to_config());
 	return cfg;
 }