diff --git a/Definitions/knockout.d.ts b/Definitions/knockout.d.ts
new file mode 100644
index 000000000..60b88f4c6
--- /dev/null
+++ b/Definitions/knockout.d.ts
@@ -0,0 +1,46 @@
+// Type definitions for Knockout 2.1.0
+// https://github.com/borisyankov/DefinitelyTyped
+
+interface KnockoutStatic {
+
+    applyBindings(viewModel, rootNode);
+    computed();
+}
+
+interface KnockoutUtilsStatic {
+    arrayForEach(array, action);
+    arrayIndexOf(array, item);
+    arrayFirst(array, predicate, predicateOwner);
+    arrayRemoveItem(array, itemToRemove);
+    arrayGetDistinctValues(array);
+    arrayMap(array, mapping);
+    arrayFilter(array, predicate);
+    arrayPushAll(array, valuesToPush);
+    extend(target, source);
+    emptyDomNode(domNode);
+    moveCleanedNodesToContainerElement(nodes);
+    setDomNodeChildren(domNode, childNodes);
+    replaceDomNodes(nodeToReplaceOrNodeArray, newNodesArray);
+    setOptionNodeSelectionState(optionNode, isSelected);
+    stringTrim(str: string);
+    stringTokenize(str: string, delimiter);
+    stringStartsWith(str: string, startsWith);
+    buildEvalWithinScopeFunction(expression, scopeLevels);
+    domNodeIsContainedBy(node, containedByNode);
+    domNodeIsAttachedToDocument(node);
+    tagNameLower(element);
+    registerEventHandler(element, eventType, handler);
+    triggerEvent(element, eventType);
+    unwrapObservable(value);
+    toggleDomNodeCssClass(node, className, shouldHaveClass);
+    setTextContent(element, textContent);
+    ensureSelectElementIsRenderedCorrectly(selectElement);
+    range(min, max);
+    makeArray(arrayLikeObject);
+    getFormFields(form, fieldName);
+    parseJson(jsonString);
+    stringifyJson(data, replacer, space);
+    postJson(urlOrForm, data, options);
+}
+
+declare var ko: KnockoutStatic;
\ No newline at end of file