diff --git a/lib/c/docs/api.md b/lib/c/docs/api.md
index fe2e3e4dbf5398c64fb8738feedd5aac6647a4ca..828e8d3404a45dd20e9d92b3e49baca49e83eb60 100644
--- a/lib/c/docs/api.md
+++ b/lib/c/docs/api.md
@@ -111,7 +111,7 @@ catClientInitWithConfig("ccat", &config);
 
 Disable the `ccat`, shutdown `sender`, `monitor` and `aggregator` threads.
 
-Also release all the resources that have been used.
+And then release all the resources that have been used.
 
 ```c
 int catClientDestroy();
diff --git a/lib/cpp/docs/api.md b/lib/cpp/docs/api.md
index 72a145a8db9ab3a7cd57b13522f2ed52b92bb709..c44c3f9a2397905046ce4d1874f230a6a818419e 100644
--- a/lib/cpp/docs/api.md
+++ b/lib/cpp/docs/api.md
@@ -64,7 +64,7 @@ int main() {
 
 ## API list
 
-All the `cppcat` apis are in the `cat` namespace.
+All the `cppcat` APIs are in the `cat` namespace.
 
 ### Common apis
 
@@ -84,7 +84,7 @@ Following config is used by default.
 * `enableMultiprocessing` is false.
 * `enableDebugLog` is false.
 
-You can also customize config. (Like to use text encoder instead of binary encoder)
+You can also customize config. (Like to use text encoder instead of the binary encoder)
 
 ```cpp
 cat::Config c = cat::Config();
@@ -97,7 +97,7 @@ cat::init("cppcat", c);
 
 Disable the cat client, shutdown `sender`, `monitor` and `aggregator` threads.
 
-Also release all the resources that have been used.
+And then release all the resources that have been used.
 
 ```cpp
 void destroy();
diff --git a/lib/java/README.md b/lib/java/README.md
index 7119efdbd56dc58b5bbaac490fc5fa4ca06ac468..ac7050edc23b88247c7ebfbce3d5c27b403c3cee 100644
--- a/lib/java/README.md
+++ b/lib/java/README.md
@@ -1,6 +1,6 @@
-# Cat Client Java
+# Cat Client for Java
 
-[中文文档](./doc/zh-CN.md)
+[中文文档](./README.zh-CN.md)
 
 The java cat client supports JDK 1.6+
 
@@ -28,11 +28,11 @@ app.name={appkey}
 
 > Only English characters (a-z, A-Z), numbers (0-9), underscore (\_) and dash (-) is allowed in appkey.
 
-Due to java cat client will be lazy initialized, it's not necessary to initialize it manually.
+Due to java cat client will be lazily initialized, it's not necessary to initialize it manually.
 
 ## Quickstart
 
-```
+```java
 Transaction t = Cat.newTransaction("URL", "pageName");
 
 try {
@@ -51,13 +51,13 @@ try {
 }
 ```
 
-## Api List
+## API List
 
 ### Transaction
 
-> To avoid of forgetting to complete the Transaction, it's better to surround the Transaction by a try-catch-finally block.
+> To avoid forgetting to complete the Transaction, it's better to surround the Transaction by a try-catch-finally block.
 
-```
+```java
 Transaction t = Cat.newTransaction("URL", "pageName");
 
 try {
@@ -82,7 +82,7 @@ We offered a series of APIs to modify the Transaction.
 
 These APIs can be easily used with the following codes.
 
-```
+```java
 Transaction t = Cat.newTransaction("URL", "pageName");
 
 try {
@@ -124,15 +124,15 @@ Log an error with error stack info.
 
 Error is a special event, the type of it depend on the class of the given `Throwable e`.
 
-1. If `e` is an instanceof `Error`, the `type` will be set to `Error`
-2. Else if `e` is an instanceof `RuntimeException`, the `type` will be set to `RuntimeException`
+1. If `e` is an instanceof `Error`, the `type` will be set to `Error`.
+2. Else if `e` is an instanceof `RuntimeException`, the `type` will be set to `RuntimeException`.
 3. The `type` will be set to `Exception` in the other cases.
 
 `name` will be set to the `e.getClass().getName()` by default.
 
 And the stack info will be built and set to `data`.
 
-```
+```java
 try {
     1 / 0;
 } catch (Exception e) {
@@ -142,17 +142,13 @@ try {
 
 You can append your own error message to the top of the stack info like this:
 
-```
-try {
-    1 / 0;
-} catch (Exception e) {
-    Cat.logError("error(X) := exception(X)", e);
-}
+```java
+Cat.logError("error(X) := exception(X)", e);
 ```
 
 #### Cat.logErrorWithCategory
 
-Though `name` has been set to the classname of the given `throwable e` by default, you can use this api to overwrite it.
+Though `name` has been set to the classname of the given `throwable e` by default, you can use this API to overwrite it.
 
 ```java
 Exception e = new Exception("syntax error");
@@ -168,7 +164,7 @@ Cat.logErrorWithCategory("custom-category", "?- X = Y, Y = 2", e);
 
 ### Metric
 
-```
+```java
 # Counter
 Cat.logMetricForCount("metric.key");
 Cat.logMetricForCount("metric.key", 3);
@@ -177,24 +173,24 @@ Cat.logMetricForCount("metric.key", 3);
 Cat.logMetricForDuration("metric.key", 5);
 ```
 
-We do aggregate every seconds.
+We do aggregate every second.
 
-For example, if you have called count 3 times in one second (with the same name), we will just summarised the value of them and reported once to the server.
+For example, if you have called count 3 times in one second (with the same name), we will just summarise the value of them and reported once to the server.
 
-In case of `duration`, we use `averaged` value instead of `summarised` value.
+In the case of `duration`, we use `averaged` value instead of `summarised` value.
 
 ## Integration
 
 ### Log component integration
 
-[log4j](../../integration/log4j/README.md)
-[log4j2](../../integration/log4j2/README.md)
-[logback](../../integration/logback/README.md)
+* [log4j](../../integration/log4j/README.md)
+* [log4j2](../../integration/log4j2/README.md)
+* [logback](../../integration/logback/README.md)
 
 ### URL monitoring integration
 
-[URL monitoring integration with web.xml](../../integration/URL/README.md)
-[URL monitoring integration with springboot](../../integration/spring-boot/README.md)
+* [URL monitoring integration with web.xml](../../integration/URL/README.md)
+* [URL monitoring integration with springboot](../../integration/spring-boot/README.md)
 
 ### Other integration solutions
 
diff --git a/lib/java/doc/zh-CN.md b/lib/java/README.zh-CN.md
similarity index 99%
rename from lib/java/doc/zh-CN.md
rename to lib/java/README.zh-CN.md
index 70733c342660d93b974423eaa18ae0efe6f8b14f..2ebedd661a45bb8caa5e70f618728a69807d342c 100644
--- a/lib/java/doc/zh-CN.md
+++ b/lib/java/README.zh-CN.md
@@ -47,7 +47,7 @@ try {
 }
 ```
 
-## Api List
+## API List
 
 ### Transaction
 
@@ -161,7 +161,7 @@ Cat.logErrorWithCategory("custom-category", "?- X = Y, Y = 2", e);
 
 记录业务指标的总和或平均值。
 
-```
+```java
 # Counter
 Cat.logMetricForCount("metric.key");
 Cat.logMetricForCount("metric.key", 3);
diff --git a/lib/python/README.md b/lib/python/README.md
index 2c75dc627afc67f1e3f79fe9f7ac5d5fdd93d7fe..1b330f960ae0e58f283038967f40d43c8d40e7e9 100644
--- a/lib/python/README.md
+++ b/lib/python/README.md
@@ -32,9 +32,9 @@ cat.init("appkey")
 
 ### Coroutine Mode
 
-Since we are using `ThreadLocal` to storage the transaction stack in `ccat`, which is neccessary to build the `message tree`, and `pycat` is highly dependent on `ccat`. (with cffi)
+Since we are using `ThreadLocal` to storage the transaction stack in `ccat`, which is necessary to build the `message tree`, and `pycat` is highly dependent on `ccat`. (with cffi)
 
-So we don't support message tree in `coroutine` modes, like `gevent`, `greenlet` because different coroutines that in the same thread run alternately.
+So we don't support message tree in `coroutine` modes, like `gevent`, `greenlet` because of different coroutines that in the same thread run alternately.
 
 In these cases, you should use the following code to initialize `pycat`.
 
@@ -64,7 +64,7 @@ cat.init("appkey", encoder=cat.ENCODER_TEXT)
 
 Sometimes you may want to enable the debug log.
 
-Note the logs will be outputed to `console`.
+Note the logs will be outputted to `console`.
 
 ```python
 cat.init("appkey", debug=True)
@@ -93,7 +93,7 @@ with cat.Transaction("foo", "bar") as t:
 time.sleep(1)
 ```
 
-## Api List
+## API List
 
 ### Transaction
 
@@ -102,13 +102,13 @@ t = cat.Transaction("Trans", "t3")
 t.complete()
 ```
 
-To avoid of forgetting to complete the transaction, we strongly recommend you to surround the transaction by a `try-finally` block, and complete the transaction in the `finally` code block.
+To avoid forgetting to complete the transaction, we strongly recommend you to surround the transaction by a `try-finally` block and complete the transaction in the `finally` code block.
 
 ```python
 try:
-	t = cat.Transaction("Trans", "t3")
+    t = cat.Transaction("Trans", "t3")
 finally:
-	t.complete()
+    t.complete()
 ```
 
 We also provide `decorator` and `context manager` usages, which can complete the transaction automatically.
@@ -126,9 +126,9 @@ def test():
     cat.log_event("Event", "E2")
 ```
 
-If something goes wrong in the decorated function, the status of the transaction will be set to `FAILED`, and whatever the function raised a exception or not, the transaction will be auto-completed.
+If something goes wrong in the decorated function, the status of the transaction will be set to `FAILED`, and whatever the function raised an exception or not, the transaction will be auto-completed.
 
-The only problem is that you can't get the transaction object if you monitor a function via decorator.
+The only problem is that you can't get the transaction object if you monitor a function via a decorator.
 
 #### via context manager
 
@@ -142,7 +142,7 @@ with cat.Transaction("Transaction", "T1") as t:
     t.add_data("hello world!")
 ```
 
-If something goes wrong in the `with` context, the status of the transaction will be set to `FAILED`, and whatever the code block raised a exception or not, the transaction will be auto-completed.
+If something goes wrong in the `with` context, the status of the transaction will be set to `FAILED`, and whatever the code block raised an exception or not, the transaction will be auto-completed.
 
 Though it is a bit complex, you can get the transaction object :)
 
@@ -256,8 +256,8 @@ cat.metric("metric1").count(5)
 cat.metric("metric2").duration(100)
 ```
 
-We do aggregate every seconds.
+We do aggregate every second.
 
-For example, if you have called count 3 times in one second (with the same name), we will just summarised the value of them and report once to the server.
+For example, if you have called count 3 times in one second (with the same name), we will just summarise the value of them and report once to the server.
 
-In case of `duration`, we use `averaged` value instead of `summarised` value.
+In the case of `duration`, we use `averaged` value instead of `summarised` value.
diff --git a/lib/python/README.zh-CN.md b/lib/python/README.zh-CN.md
index 50bb3cedf677821e6940dcdb18446ca43f875ba7..44a30089edaaa9b9fcd514959c707201d2f45a75 100644
--- a/lib/python/README.zh-CN.md
+++ b/lib/python/README.zh-CN.md
@@ -91,7 +91,7 @@ with cat.Transaction("foo", "bar") as t:
 time.sleep(1)
 ```
 
-## Api List
+## API List
 
 ### Transaction