diff --git a/knockback/knockback.d.ts b/knockback/knockback.d.ts
index 71773ab92..08798d47a 100644
--- a/knockback/knockback.d.ts
+++ b/knockback/knockback.d.ts
@@ -163,6 +163,8 @@ declare module Knockback {
     }
 
     interface Static extends Utils {
+    	ViewModel;
+    	CollectionObservable;
         collectionObservable(model?: Backbone.Collection<Backbone.Model>, options?: CollectionOptions): CollectionObservable;
     	/** Base class for observing model attributes. */
     	observable(