diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..3fab6f7
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,2 @@
+export declare function atob(val: string): string;
+export declare function btoa(val: string): string;
\ No newline at end of file
diff --git a/package.json b/package.json
index 96fa3db..6560a04 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.0.2",
   "description": "atob and btoa for browsers or node",
   "main": "index.js",
+  "types": "index.d.ts",
   "browser": "browser.js",
   "devDependencies": {
     "chai": "^2.3.0",
@@ -39,4 +40,4 @@
     "url": "https://github.com/ksheedlo/isomorphic-base64/issues"
   },
   "homepage": "https://github.com/ksheedlo/isomorphic-base64"
-}
+}
\ No newline at end of file