diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index 5c9ab58f3..3c2eaaca0 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -413,8 +413,8 @@ interface KnockoutStatic {
     virtualElements: KnockoutVirtualElements;
     extenders: KnockoutExtenders;
 
-    applyBindings(viewModel?: any, rootNode?: any): void;
-	applyBindingsToDescendants(viewModel: any, rootNode: any): void;
+    applyBindings(viewModelOrBindingContext?: any, rootNode?: any): void;
+	applyBindingsToDescendants(viewModelOrBindingContext: any, rootNode: any): void;
 	applyBindingAccessorsToNode(node: Node, bindings: (bindingContext: KnockoutBindingContext, node: Node) => {}, bindingContext: KnockoutBindingContext): void;
 	applyBindingAccessorsToNode(node: Node, bindings: {}, bindingContext: KnockoutBindingContext): void;
 	applyBindingAccessorsToNode(node: Node, bindings: (bindingContext: KnockoutBindingContext, node: Node) => {}, viewModel: any): void;