diff --git a/src/types.ts b/src/types.ts
index 5e172ea..3a61c33 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -16,7 +16,8 @@ export type LineOptions = Options & {
     zoomOut?: (centers: {
       x: number;
       y: number;
-    }, range: AxisRange[]) => void;
+    }, range: AxisRange[]) => void,
+    mouseMove?: (evt: MouseObj) => void
   }
 }