diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index f897e263ef..426449ac05 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -88,6 +88,7 @@ All definitions files include a header with the author and editors, so at some p
 * [GoJS](http://gojs.net/) (by [Barbara Duckworth](https://github.com/barbara42))
 * [Greasemonkey](http://www.greasespot.net/) (by [Kota Saito](https://github.com/kotas))
 * [GreenSock Animation Platform (GSAP)](http://www.greensock.com/get-started-js/) (by [Robert S.](https://github.com/codeBelt))
+* [gridfs-stream](https://github.com/aheckmann/gridfs-stream) (by [Lior Mualem](https://github.com/liorm))
 * [Grunt JS](http://gruntjs.com/) (by [Jeff May](https://github.com/jeffmay), [Basarat Ali Syed](https://github.com/basarat) and [San Chen](https://github.com/bigsan))
 * [Google API Client](https://code.google.com/p/google-api-javascript-client/) (by [Frank M](https://github.com/sgtfrankieboy))
 * [Google App Engine Channel API](https://developers.google.com/appengine/docs/java/channel/javascript) (by [vvakame](https://github.com/vvakame))
diff --git a/express/express.d.ts b/express/express.d.ts
index 562dbf3013..eafc4c5966 100644
--- a/express/express.d.ts
+++ b/express/express.d.ts
@@ -240,7 +240,7 @@ declare module "express" {
             count: number;
         }
 
-        interface Request extends Express.Request {
+        interface Request extends http.ServerRequest, Express.Request {
 
             session: Session;
 
diff --git a/gridfs-stream/gridfs-stream-tests.ts b/gridfs-stream/gridfs-stream-tests.ts
new file mode 100644
index 0000000000..c9ca457c2a
--- /dev/null
+++ b/gridfs-stream/gridfs-stream-tests.ts
@@ -0,0 +1,37 @@
+/// <reference path="gridfs-stream.d.ts" />
+/// <reference path="../mongodb/mongodb.d.ts" />
+/// <reference path="../node/node.d.ts" />
+
+// Samples from:
+// https://github.com/aheckmann/gridfs-stream
+
+import fs = require('fs');
+import mongo = require('mongodb');
+import Grid = require('gridfs-stream');
+
+// create or use an existing mongodb-native db instance
+var db = new mongo.Db('gridfs-stream-test', new mongo.Server("127.0.0.1", 27017));
+var gfs = Grid(db, mongo);
+
+// streaming to gridfs
+var writestream = gfs.createWriteStream({
+    filename: 'my_file.txt'
+});
+fs.createReadStream('blob.txt').pipe(writestream);
+
+// streaming from gridfs
+var readstream = gfs.createReadStream({
+    filename: 'my_file.txt'
+});
+
+//error handling, e.g. file does not exist
+readstream.on('error', function (err: any) {
+    console.log('An error occurred!', err);
+    throw err;
+});
+
+var bufs: Array<any> = [];
+readstream.on('data', function(d: any){ bufs.push(d); });
+readstream.on('end', function() {
+    var buf = Buffer.concat(bufs);
+});
diff --git a/gridfs-stream/gridfs-stream.d.ts b/gridfs-stream/gridfs-stream.d.ts
new file mode 100644
index 0000000000..a8ad5f9ed3
--- /dev/null
+++ b/gridfs-stream/gridfs-stream.d.ts
@@ -0,0 +1,68 @@
+// Type definitions for gridfs-stream 0.5.0
+// Project: https://github.com/aheckmann/gridfs-stream
+// Definitions by: Lior Mualem <https://github.com/liorm/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+/// <reference path="../mongodb/mongodb.d.ts" />
+
+declare module GridFSStream {
+    export interface Range {
+        startPos: number;
+        endPos: number;
+    }
+
+    export interface Options {
+        _id?: string;
+        filename?: string;
+        mode?: string;
+
+        range?: Range;
+
+        // any other options from the GridStore may be passed too, e.g.
+        chunkSize?: number;
+        content_type?: string;
+        root?: string;
+        metadata?: any;
+    }
+
+    export interface WriteStream extends NodeJS.WritableStream {
+        writable: boolean;
+        name: string;
+        id: string;
+        options: Options;
+        mode: string;
+    }
+
+    export interface ReadStream extends NodeJS.ReadableStream {
+        readable: boolean;
+        paused: boolean;
+    }
+}
+
+declare module "gridfs-stream" {
+    import mongo = require('mongodb');
+
+    // Merged declaration, g is both a callable function and a namespace
+    function g(db: any, mongo: any): g.Grid;
+
+    module g {
+
+        export class Grid {
+
+            files: mongo.Collection;
+            collection(name?: string): mongo.Collection;
+
+            createWriteStream(options?: GridFSStream.Options): GridFSStream.WriteStream;
+            createReadStream(options?: GridFSStream.Options): GridFSStream.ReadStream;
+            createWriteStream(options?: string): GridFSStream.WriteStream;
+            createReadStream(options?: string): GridFSStream.ReadStream;
+
+            remove(options: GridFSStream.Options, callback: (err: Error) => void): void;
+            exist(options: GridFSStream.Options, callback: (err: Error, found: boolean) => void): void;
+        }
+    }
+
+    export = g;
+}
+