diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..67cb6cb
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,10 @@
+declare module "ampify" {
+  export = ampify;
+}
+
+declare function ampify(html: string, options?: IOptions): Promise<string>;
+
+interface IOptions {
+  cwd?: string;
+  round?: boolean;
+}
diff --git a/package.json b/package.json
index c7484cf..a332bb5 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "0.5.0",
   "description": "Convert plain HTML to Google Accelerated Mobile Pages (AMP)",
   "main": "index.js",
+  "types": "index.d.ts",
   "author": {
     "name": "rkazakov",
     "email": "ruslan.kazakov@gmail.com"