diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..61de3a3
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,5 @@
+declare module 'express-query-boolean' {
+    import { Request, Response, NextFunction } from 'express'
+
+    export default function parseBool(): (req: Request, res: Response, next: NextFunction) => void
+}
diff --git a/package.json b/package.json
index 92dd16d..ddce1ae 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "2.0.0",
   "description": "Convert query strings to dates for express/connect applications.",
   "main": "index.js",
+  "types": "index.d.ts",
   "directories": {
     "test": "test"
   },