diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index 79612aa..33bfb74 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -124,6 +124,8 @@ export interface SceneModel {
   visible: boolean;
   locked: boolean;
   fineTuning: FineTuning;
+  /** Local rotation (xyzw) that aligns the model's intrinsic axes to world axes. */
+  calibrationQuat: [number, number, number, number] | null;
 }
 
 const MAX_MODELS = 5;