diff --git a/.gitignore b/.gitignore
index b25c15b..7950ebc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
 *~
+
+# IDEA project files
+*.iml
+.idea
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..3a925ff
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,15 @@
+///<reference types="node" />
+///<reference types="ws" />
+
+import * as stream from 'stream';
+import * as webSocket from 'ws';
+
+declare class WebSocketJSONStream extends stream.Duplex {
+    constructor(ws: webSocket);
+
+    ws: webSocket;
+}
+
+declare namespace WebSocketJSONStream {}
+
+export = WebSocketJSONStream;
diff --git a/package.json b/package.json
index f37c087..4edad70 100644
--- a/package.json
+++ b/package.json
@@ -3,14 +3,25 @@
   "version": "0.0.3",
   "description": "Expose WebSockets with JSON as an object stream",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "keywords": ["websockets", "websocket", "ws", "stream", "streams"],
+  "keywords": [
+    "websockets",
+    "websocket",
+    "ws",
+    "stream",
+    "streams"
+  ],
   "author": "Avital Oliver <avital@aoliver.org>",
   "repository": {
     "type": "git",
     "url": "git://github.com/avital/websocket-json-stream.git"
   },
-  "license": "MIT"
+  "license": "MIT",
+  "dependencies": {
+    "@types/node": "*",
+    "@types/ws": "*"
+  }
 }