diff --git a/swaggerize-express/swaggerize-express.d.ts b/swaggerize-express/swaggerize-express.d.ts
new file mode 100644
index 000000000..ee7f5ca88
--- /dev/null
+++ b/swaggerize-express/swaggerize-express.d.ts
@@ -0,0 +1,45 @@
+// Type definitions for swaggerize-express 4.x
+// Project: https://github.com/krakenjs/swaggerize-express
+// Definitions by: TANAKA Koichi <https://github.com/mugeso/>
+
+/* =================== USAGE ===================
+
+ import express = require('express');
+ import swaggerize = require('swaggerize-express');
+ var app = express();
+ app.use(swaggerize({
+    api: require('./api.json'),
+    docspath: '/api-docs',
+    handlers: './handlers'
+ });
+
+ =============================================== */
+
+declare module "swaggerize-express" {
+    import express = require('express');
+    function swaggerize(options: swaggerize.Options): express.RequestHandler;
+
+    module swaggerize {
+        export interface ISwaggerApiDefinition {
+            swagger: string
+            host: string
+        }
+
+        export interface Options {
+            api: ISwaggerApiDefinition
+            docspath: String
+            handlers: String
+        }
+
+        export interface IConfig {
+            api: ISwaggerApiDefinition
+            routes: express.IRoute[]
+        }
+
+        export interface SwaggerizedExpress extends express.Express {
+            swagger: IConfig
+        }
+    }
+
+    export = swaggerize;
+}