diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index 62cc9f9..ba96846 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -538,6 +538,8 @@ export const useModelStore = create<ModelStore>((set, get) => ({
   gridAutoFollow: true,
   setGridAutoFollow: (gridAutoFollow) => set({ gridAutoFollow }),
   nudgeGridY: (delta) => set((s) => ({ gridY: s.gridY + delta, gridAutoFollow: false })),
+  gridCalibMode: false,
+  setGridCalibMode: (gridCalibMode) => set({ gridCalibMode }),
 
   wireframeColor: '#00f3ff',
   setWireframeColor: (wireframeColor) => set({ wireframeColor }),