diff --git a/knockout.postbox/knockout-postbox.d.ts b/knockout.postbox/knockout-postbox.d.ts
index 3e66988510..daa35458ab 100644
--- a/knockout.postbox/knockout-postbox.d.ts
+++ b/knockout.postbox/knockout-postbox.d.ts
@@ -19,6 +19,14 @@ interface KnockoutObservable<T> {
     syncWith(topic: string, initializeWithLatestValue?: boolean, skipInitialPublish?: boolean, equalityComparer?: (newValue: T, oldValue: T) => boolean): KnockoutObservable<T>;
 }
 
+interface KnockoutObservableArray<T> {
+	subscribeTo(topic: string, useLastPublishedValueToInitialize?: boolean, transform?: (val: any) => T): KnockoutObservableArray<T>;
+	unsubscribeFrom(topic: string): KnockoutObservableArray<T>;
+	publishOn(topic: string, skipInitialPublish?: boolean, equalityComparer?: (newValue: T, oldValue: T) => boolean): KnockoutObservableArray<T>;
+	stopPublishingOn(topic: string): KnockoutObservableArray<T>;
+	syncWith(topic: string, initializeWithLatestValue?: boolean, skipInitialPublish?: boolean, equalityComparer?: (newValue: T, oldValue: T) => boolean): KnockoutObservableArray<T>;
+}
+
 interface KnockoutStatic {
     postbox: KnockoutPostBox;
 }
\ No newline at end of file
diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index 63f9938943..03240484cc 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -74,6 +74,7 @@ interface KnockoutComputed<T> extends KnockoutSubscribable<T>, KnockoutComputedF
 	dispose(): void;
 	isActive(): boolean;
 	getDependenciesCount(): number;
+    extend(requestedExtenders: { [key: string]: any; }): KnockoutComputed<T>;
 }
 
 interface KnockoutObservableArrayStatic {
@@ -83,6 +84,7 @@ interface KnockoutObservableArrayStatic {
 }
 
 interface KnockoutObservableArray<T> extends KnockoutObservable<T[]>, KnockoutObservableArrayFunctions<T> {
+    extend(requestedExtenders: { [key: string]: any; }): KnockoutObservableArray<T>;
 }
 
 interface KnockoutObservableStatic {
@@ -95,6 +97,7 @@ interface KnockoutObservable<T> extends KnockoutSubscribable<T>, KnockoutObserva
 	peek(): T;
 	valueHasMutated(): void;
 	valueWillMutate(): void;
+    extend(requestedExtenders: { [key: string]: any; }): KnockoutObservable<T>;
 }
 
 interface KnockoutComputedDefine<T> {
@@ -116,6 +119,7 @@ interface KnockoutBindingContext {
 
     extend(any): any;
     createChildContext(any): any;
+    createChildContext(a: any, b: any, c: Function): any;
 }
 
 interface KnockoutBindingHandler {
@@ -233,6 +237,8 @@ interface KnockoutUtils {
 
     fieldsIncludedWithJsonPost: any[];
 
+    compareArrays<T>(a: T[], b: T[]): Array<KnockoutArrayChange<T>>;
+
     arrayForEach<T>(array: T[], action: (item: T) => void): void;
 
     arrayForEach(array: any[], action: (any) => void ): void;
@@ -328,6 +334,12 @@ interface KnockoutUtils {
     isIe7: boolean;
 }
 
+interface KnockoutArrayChange<T> {
+    status: string;
+    value: T;
+    index: number;
+}
+
 //////////////////////////////////
 // templateSources.js
 //////////////////////////////////