diff --git a/CHANGELOG.md b/CHANGELOG.md
index 644e3ac..4a404ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ## ChangeLog for: chainjs
 
+## Version 0.0.2 - 2013/12/27
+
+- [Feature]: add filter() api 
+- [Feature]: addstop() api
+
 ## Version 0.0.1 - 2013/12/25
 
-- Pop step handler use cursor index instead of handlers.shift
-- Implemence AOP: before api
\ No newline at end of file
+- [Normal]: Pop step handler use cursor index instead of handlers.shift
+- [Feature]: Implemence AOP: before() api
\ No newline at end of file
diff --git a/README.md b/README.md
index 20a51ae..a9497b0 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,23 @@ Start the chain and invoke start handler
 Chain(func).then(func1).then(func2).start();
 ```
 
+### start()
+Start the chain and invoke start handler
+```javascript
+Chain(func).then(func1).then(func2).start();
+```
+
+### stop()
+Stop the chain, mark the chain as ending and destroy local variable
+__notice:__after use chain.stop(), the chain contiue execute current step handler, 
+so use with return for stoping current step excution
+```javascript
+Chain(func).then(function (chain) {
+    chain.stop();
+    return;
+}).start();
+```
+
 ### next(nextParams)
 Go to next step
 ```javascript
@@ -83,8 +100,7 @@ var chainData = chain.data();
 ```
 
 ### before(beforeHandler)
-
-Will be invoked before each step
+Will be invoked before each step in sync
 ```javascript
 Chain(function (chain) {chain.next();})
     .then(function (chain) { // Step 1
@@ -98,6 +114,21 @@ Chain(function (chain) {chain.next();})
     .start();
 ```
 
+### filter(filterHandler)
+Invoked before `before` and `step` handler, it run before each chain step, you should use filter.next() 
+continue execute next filter or execute current step handler. If use filter.chain in filter, 
+the chain will skip current step handler and go to next step handler
+```javascript
+Chain(func, param)
+    .then(func)
+    .filter(function (filter) {
+        console.log('run filter');
+        setTimeout( function() {
+            filter.next();
+        });
+    });
+```
+
 ## Testing
 
 ```bash
diff --git a/build/chain.browser.js b/build/chain.browser.js
index 328a091..773a4e8 100644
--- a/build/chain.browser.js
+++ b/build/chain.browser.js
@@ -278,7 +278,7 @@ if (typeof exports !== 'undefined') {
     }
     exports.Chain = Chain;
 } else {
-    root.Chain = Chain;
+    this.Chain = Chain;
 }
 
 });
\ No newline at end of file
diff --git a/chain.js b/chain.js
index 05e3cad..39f64f8 100644
--- a/chain.js
+++ b/chain.js
@@ -276,5 +276,5 @@ if (typeof exports !== 'undefined') {
     }
     exports.Chain = Chain;
 } else {
-    root.Chain = Chain;
+    this.Chain = Chain;
 }
\ No newline at end of file
diff --git a/package.json b/package.json
index 8d79274..78415fd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chainjs",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "Use chaining call to resolve the problem of javascript async callback handle ",
   "main": "chain.js",
   "scripts": {