diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47742e6..6e784b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.0.3 2016-06-01
+- add `onCancel` to support clean up
+- use esformatter, remove jsbeautify
+
 ## v0.0.2 2016-05-15
 - make `ptimeout.TimeoutError` inherits from `Error`
 
diff --git a/README.md b/README.md
index 1f30469..e8bb7ee 100644
--- a/README.md
+++ b/README.md
@@ -17,9 +17,10 @@ $ npm i promise.timeout --save
 
 ## API
 
-`ptimeout(fn, timeout)`
+`ptimeout(fn, timeout, cancel)`
 - `fn` the async function
 - `timeout` in ms
+- `cancel` Boolean, whether support onCancel
 
 ```js
 var ptimeout = require('promise.timeout');
@@ -52,6 +53,37 @@ _50.should.be.ok();
 _50.should.equal(20);
 ```
 
+### onCancel
+
+1. pass `cancel = true` to `ptimeout(fn, ms, cancel)`
+2. use `onCancel` para to register clean callback
+
+```js
+var ptimeout = require('promise.timeout');
+
+// a function will cost 20ms
+function test(onCancel) {
+  return new Promise(function(resolve, reject) {
+    const timer = setTimeout(function() {
+      resolve(20);
+    }, 20);
+
+    // custom clean
+    onCancel && onCancel(() => {
+      clearTimeout(timer);
+    });
+  });
+}
+
+const test10 = ptimeout(test, 10, true); // enable cancel
+try {
+  yield test10();
+} catch (e) {
+  e.should.ok();
+}
+```
+
+
 ## Changelog
 
 [CHANGELOG.md](CHANGELOG.md)
diff --git a/test/simple.js b/test/simple.js
index d3d2fc6..e96bb3d 100644
--- a/test/simple.js
+++ b/test/simple.js
@@ -49,8 +49,8 @@ describe('simple use', function() {
           resolve(20);
         }, 20);
 
-        // clean
-        onCancel && onCancel(function() {
+        // custom clean
+        onCancel && onCancel(() => {
           clearTimeout(timer);
         });
       });