diff --git a/iscroll/iscroll-lite.d.ts b/iscroll/iscroll-lite.d.ts
index c01f5db47..085f844b0 100644
--- a/iscroll/iscroll-lite.d.ts
+++ b/iscroll/iscroll-lite.d.ts
@@ -34,8 +34,8 @@ interface iScrollOptions {
 
 declare class iScroll {
 
-    constructor (element: string);
-    constructor (element: string, options: iScrollOptions);
+    constructor (element: string, options?: iScrollOptions);
+	constructor (element: HTMLElement, options?: iScrollOptions);
 
     destroy(): void;
     refresh(): void;
diff --git a/iscroll/iscroll-tests.ts b/iscroll/iscroll-tests.ts
index 9edefab34..4938a609b 100644
--- a/iscroll/iscroll-tests.ts
+++ b/iscroll/iscroll-tests.ts
@@ -16,4 +16,8 @@ var myScroll4 = new iScroll('wrapper', {
 });
 var myScroll6 = new iScroll('wrapper', { scrollbarClass: 'myScrollbar' });
 
-myScroll1.refresh();
\ No newline at end of file
+myScroll1.refresh();
+
+
+var myScroll6 = new iScroll(document.getElementById('wrapper'));
+var myScroll7 = new iScroll(document.getElementById('wrapper'), { scrollbarClass: 'myScrollbar' });
\ No newline at end of file
diff --git a/iscroll/iscroll.d.ts b/iscroll/iscroll.d.ts
index a702ebb5e..4c89038ed 100644
--- a/iscroll/iscroll.d.ts
+++ b/iscroll/iscroll.d.ts
@@ -59,8 +59,8 @@ interface iScrollOptions {
 
 declare class iScroll {
 
-    constructor (element: string);
-    constructor (element: string, options: iScrollOptions);
+    constructor (element: string, options?: iScrollOptions);
+	constructor (element: HTMLElement, options?: iScrollOptions);
 
     destroy(): void;
     refresh(): void;