diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index 4d978f0..450b625 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -114,12 +114,18 @@ export interface Measurement {
   pointA: MeasurePoint;
   pointB: MeasurePoint;
   distanceMM: number;
+  /** 'distance' = point-to-point (default), 'hole' = registered diameter at center, 'edge' = registered edge length */
+  kind?: 'distance' | 'hole' | 'edge';
+  /** Optional pre-formatted label (e.g. "Ø 12.5"). When absent, UI formats distanceMM. */
+  label?: string;
 }
 
 export interface HoverInfo {
   type: 'hole' | 'edge';
   position: [number, number, number];
-  value: number; // mm
+  value: number; // mm (diameter or length)
+  /** For edges: the two endpoints in world coords. */
+  endpoints?: { a: MeasurePoint; b: MeasurePoint };
 }
 
 export interface ChecklistItem {