diff --git a/iscroll/iscroll-5.d.ts b/iscroll/iscroll-5.d.ts
index 31e9acaf6c..b4a8d62763 100644
--- a/iscroll/iscroll-5.d.ts
+++ b/iscroll/iscroll-5.d.ts
@@ -65,6 +65,9 @@ interface IScrollOptions {
 	click?: boolean;
 	invertWheelDirection?: boolean;
 	eventPassthrough?: string | boolean;
+
+	// iScroll probe edition
+	probeType?: number;
 }
 
 declare class IScroll {