diff --git a/README.md b/README.md
index 59104d4d5..3bdc14e4e 100755
--- a/README.md
+++ b/README.md
@@ -137,6 +137,7 @@ List of Definitions
 * [Knockout.js](http://knockoutjs.com/) (by [Boris Yankov](https://github.com/borisyankov))
 * [Knockout.DeferredUpdates](https://github.com/mbest/knockout-deferred-updates) (by [Sebastián Galiano](https://github.com/sgaliano))
 * [Knockout.ES5](https://github.com/SteveSanderson/knockout-es5) (by [Sebastián Galiano](https://github.com/sgaliano))
+* [Knockout.Mapper](https://github.com/LucasLorentz/knockout.mapper) (by [Brandon Meyer](https://github.com/BMeyerKC))
 * [Knockout.Mapping](https://github.com/SteveSanderson/knockout.mapping) (by [Boris Yankov](https://github.com/borisyankov))
 * [Knockout.Postbox](https://github.com/rniemeyer/knockout-postbox) (by [Judah Gabriel](https://github.com/JudahGabriel))
 * [Knockout.Validation](https://github.com/ericmbarnard/Knockout-Validation) (by [Dan Ludwig](https://github.com/danludwig))
diff --git a/knockout.mapper/knockout.mapper.d.ts b/knockout.mapper/knockout.mapper.d.ts
new file mode 100644
index 000000000..8052e4cc7
--- /dev/null
+++ b/knockout.mapper/knockout.mapper.d.ts
@@ -0,0 +1,15 @@
+// Type definitions for Knockout.Mapper 
+// Project: https://github.com/LucasLorentz/knockout.mapper
+// Definitions by: Brandon Meyer <https://github.com/BMeyerKC>
+// Definitions https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../knockout/knockout.d.ts" />
+
+interface KnockoutMapper {
+    fromJS(value: any, options?: any, target?: any, wrap?: boolean): any;
+    toJS(value: any, options?: any): any;
+}
+
+interface KnockoutStatic {
+    mapper: KnockoutMapper;
+}
\ No newline at end of file