diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 77f65f517..cd8bb9ff5 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -69,6 +69,7 @@ All definitions files include a header with the author and editors, so at some p
 * [Crossfilter](https://github.com/square/crossfilter) (by [Schmulik Raskin](https://github.com/schmuli))
 * [crypto-js](https://code.google.com/p/crypto-js/) (by [Gia Bảo @ Sân Đình](https://github.com/giabao)). @see [cryptojs.d.ts repo](https://github.com/giabao/cryptojs.d.ts)
 * [d3.js](http://d3js.org/) (from TypeScript samples)
+* [debug](https://github.com/visionmedia/debug) (by [Seon-Wook Park](https://github.com/swook))
 * [dhtmlxGantt](http://dhtmlx.com/docs/products/dhtmlxGantt) (by [Maksim Kozhukh](http://github.com/mkozhukh))
 * [dhtmlxScheduler](http://dhtmlx.com/docs/products/dhtmlxScheduler) (by [Maksim Kozhukh](http://github.com/mkozhukh))
 * [diff](https://github.com/kpdecker/jsdiff) (by [vvakame](http://github.com/vvakame))
diff --git a/debug/debug-tests.ts b/debug/debug-tests.ts
new file mode 100644
index 000000000..63a0a3ac4
--- /dev/null
+++ b/debug/debug-tests.ts
@@ -0,0 +1,20 @@
+/// <reference path="../node/node.d.ts" />
+/// <reference path="debug.d.ts" />
+
+import debug = require("debug");
+
+debug.disable();
+debug.enable("DefinitelyTyped:*");
+
+var log: debug.Debugger = debug("DefinitelyTyped:log");
+
+log("Just text");
+log("Formatted test (%d arg)", 1);
+log("Formatted %s (%d args)", "test", 2);
+
+log("Enabled?: %s", debug.enabled("DefinitelyTyped:log"));
+log("Namespace: %s", log.namespace);
+
+var error: debug.Debugger = debug("DefinitelyTyped:error");
+error.log = console.error.bind(console);
+error("This should be printed to stderr");
diff --git a/debug/debug.d.ts b/debug/debug.d.ts
new file mode 100644
index 000000000..1a71725a8
--- /dev/null
+++ b/debug/debug.d.ts
@@ -0,0 +1,30 @@
+// Type definitions for debug
+// Project: https://github.com/visionmedia/debug
+// Definitions by: Seon-Wook Park <https://github.com/swook>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "debug" {
+
+    function d(namespace: string): d.Debugger;
+
+    module d {
+        export var log: Function;
+
+        function enable(namespaces: string): void;
+        function disable(): void;
+
+        function enabled(namespace: string): boolean;
+
+        export interface Debugger {
+            (formatter: any, ...args: any[]): void;
+
+            enabled:   boolean;
+            log:       Function;
+            namespace: string;
+        }
+    }
+
+    export = d;
+
+}
+