diff --git a/types/through2-concurrent/index.d.ts b/types/through2-concurrent/index.d.ts
new file mode 100644
index 0000000000..c4c0928b38
--- /dev/null
+++ b/types/through2-concurrent/index.d.ts
@@ -0,0 +1,23 @@
+// Type definitions for through2-concurrent 2.0
+// Project: https://github.com/almost/through2-concurrent
+// Definitions by: Alorel <https://github.com/Alorel>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { TransformFunction, FlushCallback } from 'through2';
+import { DuplexOptions, Transform as TransformStream } from 'stream';
+
+declare function through2Concurrent(transform?: TransformFunction, flush?: FlushCallback): TransformStream;
+declare function through2Concurrent(opts?: through2Concurrent.Through2ConcurrentOptions, transform?: TransformFunction, flush?: FlushCallback): TransformStream;
+
+declare namespace through2Concurrent {
+    interface Through2ConcurrentOptions extends DuplexOptions {
+        maxConcurrency?: number;
+    }
+
+    function obj(transform?: TransformFunction, flush?: FlushCallback): TransformStream;
+    function obj(opts?: Through2ConcurrentOptions, transform?: TransformFunction, flush?: FlushCallback): TransformStream;
+}
+
+export = through2Concurrent;
diff --git a/types/through2-concurrent/through2-concurrent-tests.ts b/types/through2-concurrent/through2-concurrent-tests.ts
new file mode 100644
index 0000000000..f76c2b4d6d
--- /dev/null
+++ b/types/through2-concurrent/through2-concurrent-tests.ts
@@ -0,0 +1,27 @@
+import * as through2 from 'through2-concurrent';
+import { Transform } from 'stream';
+
+let str: Transform;
+
+const transformFn = (err: any, data: any) => {};
+function flushCb(this: Transform, cb: () => void) {
+    cb();
+}
+const opts = {
+    allowHalfOpen: false,
+    maxConcurrency: 5
+};
+
+str = through2();
+str = through2(opts);
+str = through2(transformFn);
+str = through2(opts, transformFn);
+str = through2(transformFn, flushCb);
+str = through2(opts, transformFn, flushCb);
+
+str = through2.obj();
+str = through2.obj(opts);
+str = through2.obj(transformFn);
+str = through2.obj(opts, transformFn);
+str = through2.obj(transformFn, flushCb);
+str = through2.obj(opts, transformFn, flushCb);
diff --git a/types/through2-concurrent/tsconfig.json b/types/through2-concurrent/tsconfig.json
new file mode 100644
index 0000000000..ecd3066d61
--- /dev/null
+++ b/types/through2-concurrent/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "through2-concurrent-tests.ts"
+    ]
+}
diff --git a/types/through2-concurrent/tslint.json b/types/through2-concurrent/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/through2-concurrent/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }
diff --git a/types/through2/index.d.ts b/types/through2/index.d.ts
index 3ff12ff86d..e24c15a3e3 100644
--- a/types/through2/index.d.ts
+++ b/types/through2/index.d.ts
@@ -1,19 +1,19 @@
 // Type definitions for through2 v 2.0
 // Project: https://github.com/rvagg/through2
-// Definitions by: Bart van der Schoor <https://github.com/Bartvds>, jedmao <https://github.com/jedmao>, Georgios Valotasios <https://github.com/valotas>
-//                 Ben Chauvette < https://github.com/bdchauvette>, TeamworkGuy2 <https://github.com/TeamworkGuy2>
+// Definitions by: Bart van der Schoor <https://github.com/Bartvds>,
+//                 jedmao <https://github.com/jedmao>,
+//                 Georgios Valotasios <https://github.com/valotas>,
+//                 Ben Chauvette < https://github.com/bdchauvette>,
+//                 TeamworkGuy2 <https://github.com/TeamworkGuy2>,
+//                 Alorel <https://github.com/Alorel>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
 
 import stream = require('stream');
 
-type TransformCallback = (err?: any, data?: any) => void;
-type TransformFunction = (this: stream.Transform, chunk: any, enc: string, callback: TransformCallback) => void;
-type FlushCallback = (this: stream.Transform, flushCallback: () => void) => void;
-
-declare function through2(transform?: TransformFunction, flush?: FlushCallback): stream.Transform;
-declare function through2(opts?: stream.DuplexOptions, transform?: TransformFunction, flush?: FlushCallback): stream.Transform;
+declare function through2(transform?: through2.TransformFunction, flush?: through2.FlushCallback): stream.Transform;
+declare function through2(opts?: stream.DuplexOptions, transform?: through2.TransformFunction, flush?: through2.FlushCallback): stream.Transform;
 
 declare namespace through2 {
     interface Through2Constructor extends stream.Transform {
@@ -21,6 +21,10 @@ declare namespace through2 {
         (opts?: stream.DuplexOptions): stream.Transform;
     }
 
+    type TransformCallback = (err?: any, data?: any) => void;
+    type TransformFunction = (this: stream.Transform, chunk: any, enc: string, callback: TransformCallback) => void;
+    type FlushCallback = (this: stream.Transform, flushCallback: () => void) => void;
+
 	/**
 	 * Convenvience method for creating object streams
 	 */