diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..ebc07eb
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,35 @@
+// Type definitions for connect-pg-simple 4.2
+
+import { RequestHandler } from "express";
+import { Store, SessionData, SessionOptions } from "express-session";
+import { Pool, PoolConfig } from "pg";
+
+declare function connectPgSimple(session: (options?: SessionOptions) => RequestHandler): typeof connectPgSimple.PGStore;
+
+declare namespace connectPgSimple {
+  class PGStore extends Store {
+      constructor(options?: PGStoreOptions);
+      close(): void;
+      pruneSessions(callback?: (err: Error) => void): void;
+
+      get(sid: string, callback: (err: any, session?: SessionData | null) => void): void;
+      set(sid: string, session: SessionData, callback?: (err?: any) => void): void;
+      destroy(sid: string, callback?: (err?: any) => void): void;
+
+      touch(sid: string, session: SessionData, callback?: () => void): void;
+  }
+  interface PGStoreOptions {
+      pool?: Pool;
+      pgPromise?: object; // not typed to avoid dependency to "pg-promise" module (which includes its own types)
+      conString?: string;
+      conObject?: PoolConfig;
+      ttl?: number;
+      schemaName?: string;
+      tableName?: string;
+      pruneSessionInterval?: false | number;
+      // tslint:disable-next-line:prefer-method-signature
+      errorLog?: (...args: any[]) => void;
+  }
+}
+
+export = connectPgSimple;
diff --git a/package.json b/package.json
index acd5dbd..b8580db 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "6.0.1",
   "description": "A simple, minimal PostgreSQL session store for Connect/Express",
   "url": "http://github.com/voxpelli/node-connect-pg-simple",
+  "typings": "index.d.ts",
   "repository": {
     "type": "git",
     "url": "git://github.com/voxpelli/node-connect-pg-simple.git"