diff --git a/knockout/knockout-2.2.d.ts b/knockout/knockout-2.2.d.ts
index 981752b8a..330a63037 100644
--- a/knockout/knockout-2.2.d.ts
+++ b/knockout/knockout-2.2.d.ts
@@ -62,7 +62,7 @@ interface KnockoutComputedStatic {
     fn: KnockoutComputedFunctions;
 
     (): KnockoutComputed;
-    (func: Function, context?: any): KnockoutComputed;
+    (func: Function, context?: any, options?: any): KnockoutComputed;
     (def: KnockoutComputedDefine): KnockoutComputed;
     (options?: any): KnockoutComputed;
 }