diff --git a/packages/frontend/src/pages/room.vue b/packages/frontend/src/pages/room.vue
index 51851868b0..6cbef6613e 100644
--- a/packages/frontend/src/pages/room.vue
+++ b/packages/frontend/src/pages/room.vue
@@ -310,6 +310,9 @@ onUnmounted(() => {
 	window.removeEventListener('resize', resize);
 });
 
+// todo: 掴む/離す(or 設置)のボタン出し分け
+// grabbing中かどうか、家具設置中かどうかをengineからリアクティブにもらう必要あり？
+
 function grab() {
 	engine.value.beginSelectedInstalledObjectGrabbing();
 	canvas.value!.focus();
diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index ae4df7bbb6..e464cbec34 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -23,7 +23,7 @@ import { GridMaterial } from '@babylonjs/materials';
 import { ShowInspector } from '@babylonjs/inspector';
 import { ref, watch } from 'vue';
 import { genId } from '../id.js';
-import { getObjectDef, OBJECT_DEFS } from './object-defs.js';
+import { getObjectDef } from './object-defs.js';
 import { HorizontalCameraKeyboardMoveInput } from './utility.js';
 import * as sound from '@/utility/sound.js';