diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..8e9034b
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,3 @@
+declare function dcopy<T>(arg: T): T
+
+export default dcopy
\ No newline at end of file
diff --git a/package.json b/package.json
index e555e40..a8ee868 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "mocha": "^3.2.0"
   },
   "main": "index.js",
+  "typings": "index.d.ts",
   "files": [
     "LICENSE",
     "README.md",