diff --git a/README.md b/README.md
index 0c02c00..0f01305 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ console.log(thinid());
 ```
 
 ```sh
-Output should be '3ywbk3e0-7825-e798-90ee-948s2lmw82bd'
+Output should be '171a7-0688a_69261'
 ```
 
 ## Contributors
diff --git a/__tests__/index.test.ts b/__tests__/index.test.ts
index a9dcd8e..078ca8b 100644
--- a/__tests__/index.test.ts
+++ b/__tests__/index.test.ts
@@ -1,3 +1,7 @@
+import thinid from '../src';
+
 test('Thinid Test', () => {
-  expect('thinid').toBe('thinid');
+  const id = thinid();
+  expect(id).toHaveLength(17);
+  expect(typeof id).toEqual('string');
 });
diff --git a/package.json b/package.json
index cfc5b34..74d8313 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "thinid",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "🚀📦 Create 🆔 unique ID like eating 🥞 pancakes.",
   "main": "./lib/index.js",
   "types": "./lib/index.d.ts",
diff --git a/src/index.ts b/src/index.ts
index ca0ad35..6391237 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,9 @@
-console.log('thinid');
+function s4() {
+  return Math.floor(new Date().getTime() * Math.random())
+    .toString(16)
+    .substr(1, 5);
+}
+
+export default function thinid() {
+  return s4() + '-' + s4() + '_' + s4();
+}