diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..467c2db
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,55 @@
+// Type definitions for moment-jalaali 0.7.0
+// Project: https://github.com/jalaali/moment-jalaali
+// Definitions by: Ali Taheri Moghaddar <https://github.com/alitaheri>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import moment = require("moment");
+
+export = moment;
+
+declare module "moment" {
+  type JUnitOfTime = "jYear" | "jMonth";
+
+  interface LoadPersianOptions {
+    /**
+     * Use persian digits as decribed by unicode
+     */
+    usePersianDigits?: boolean;
+    /**
+     * use dialect option to change usePersian dialect, available options are:
+     *      persian: default dialect(امرداد، آدینه، ...)
+     *      persian-modern: modern dialect(مرداد، جمعه، ...)
+     */
+    dialect?: "persian" | "persian-modern";
+  }
+
+  /**
+   * Add persian language.
+   */
+  function loadPersian(options?: LoadPersianOptions): void;
+
+  function jIsLeapYear(year: number): boolean;
+  function jDaysInMonth(year: number, month: number): number;
+
+  interface Moment {
+    startOf(jUnitOfTime: JUnitOfTime): Moment;
+    endOf(jUnitOfTime: JUnitOfTime): Moment;
+
+    add(amount: string | number, jUnitOfTime: JUnitOfTime): Moment;
+
+    subtract(amount: string | number, jUnitOfTime: JUnitOfTime): Moment;
+
+    jYear(y: number): Moment;
+    jYear(): number;
+    jMonth(M: number | string): Moment;
+    jMonth(): number;
+    jDate(d: number): Moment;
+    jDate(): number;
+    jWeek(d: number): Moment;
+    jWeek(): number;
+    jWeekYear(d: number): Moment;
+    jWeekYear(): number;
+    jDayOfYear(d: number): Moment;
+    jDayOfYear(): number;
+  }
+}
diff --git a/package.json b/package.json
index 2a2a5e8..2eb3684 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "convert"
   ],
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "mocha --reporter spec --ui bdd --colors --check-leaks test.js",
     "lint": "eslint index.js && eslint --env mocha --rule 'no-unused-expressions: 0' test.js",
@@ -45,4 +46,4 @@
     "moment-timezone": "^0.5.21",
     "rimraf": "^2.6.2"
   }
-}
+}
\ No newline at end of file