diff --git a/src/types.ts b/src/types.ts
index d5493a3..53a71b9 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -23,6 +23,7 @@ export type LineOptions = Options & {
       x: number;
       y: number;
     }, range: AxisRange[]) => void;
+    mouseMove?: (evt: MouseObj) => void;
     contextMenu?: (position: {
       x: number;
       y: number;