diff --git a/history.md b/history.md
index 798f14d99..8621d4fee 100644
--- a/history.md
+++ b/history.md
@@ -19,11 +19,15 @@
 
 ## Improvements
 * Support deserialize for no-arg class in kryo
-* Fix the bug of incorrect computation of unstopped tasks when assigning topology
-* add getValue method in AsmMetric for quick assert so that unit tests/integration tests don't have to get metrics from 
+* Add getValue method in AsmMetric for quick assert so that unit tests/integration tests don't have to get metrics from 
 nimbus
-* fixed the bug that supervisor storm.yaml is always different from nimbus storm.yaml
-* fixed the bug that kryo doesn't accept conf value of literal string "true"/"false"
+
+## Bug Fix
+* Fix the bug of incorrect computation of unstopped tasks when assigning topology
+* Fix the bug that supervisor storm.yaml is always different from nimbus storm.yaml
+* Fix the bug that kryo doesn't accept conf value of literal string "true"/"false"
+* Thanks to @gohitbear @bryant1410 @oubenruing for doc fixes.
+* Thanks to @zeromem @elloray @yunfan123 @iBuddha @Glowdable @waooog for bug fixes. 
 
 
 # Release 2.2.1
diff --git a/history_cn.md b/history_cn.md
index 8d8e6ea11..e571f1c9e 100644
--- a/history_cn.md
+++ b/history_cn.md
@@ -2,6 +2,7 @@
 [JStorm Chinese introduction](http://42.121.19.155/jstorm/JStorm-introduce.pptx)
 
 # Release 2.4.0
+
 ## New features
 * exactly-once接口支持异步checkpoint(rocksdb+hdfs)
 * 引入重构的窗口机制
@@ -11,6 +12,7 @@
 * 支持灰度发布
     1. 支持根据worker/component来进行灰度发布
     2. 支持灰度发布的回滚
+* 支持基于内存/rocksdb的KV store
 * HBase metrics插件开源
 * 支持多个metrics uploader同时写异构存储
 * MetricClient支持注册汇总到topology级别的metrics
@@ -18,8 +20,10 @@
 
 ## Improvements
 * 支持kryo中没有无参构造函数类的序列化
-* 修复调度topology的时候unstopped task的计算错误
 * 在AsmMetric中加入getValue方法,用于单测/集成测试中快速assert,而不必通过nimbus client从nimbus中获取数据
+
+## Bug Fix
+* 修复调度topology的时候unstopped task的计算错误
 * 修复supervisor中storm.yaml永远跟nimbus的storm.yaml不同,从而一直在同步的bug
 * 修复kryo配置中无法识别字符串"true"/"false"配置值的bug