diff --git a/README.md b/README.md
index 122e74d..52602f9 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@ var options = {
     webConfigPort : 8088,  // optional, internal port for web config(beta), replace this when it is conflict with your own service
     throttle      : 10,    // optional, speed limit in kb/s
     disableWebInterface : false, //optional, set it when you don't want to use the web interface
-    silent        : false, //optional, do not print anything into terminal. do not set it when you are still debugging.
+    silent        : false //optional, do not print anything into terminal. do not set it when you are still debugging.
 };
 new proxy.proxyServer(options);
 
diff --git a/proxy.js b/proxy.js
index 9108405..30cd9d8 100644
--- a/proxy.js
+++ b/proxy.js
@@ -51,12 +51,7 @@ try{
     if(fs.existsSync(path.join(process.cwd(),'rule.js'))){
         default_rule = require(path.join(process.cwd(),'rule'));
     }
-}catch(e){
-    if(e){
-        logUtil.printLog("error" + e, logUtil.T_ERR);
-        throw e;
-    }
-}
+}catch(e){}
 
 //option
 //option.type     : 'http'(default) or 'https'
diff --git a/rule_sample/rule__blank.js b/rule_sample/rule__blank.js
index 1aadb15..192ae2c 100644
--- a/rule_sample/rule__blank.js
+++ b/rule_sample/rule__blank.js
@@ -98,7 +98,7 @@ module.exports = {
     //替换服务器响应的数据
     //replace the response from the server before it's sent to the user
     //you may return either a Buffer or a string
-    //serverResData is a Buffer, you may get its content by calling serverResData.toString()
+    //serverResData is a Buffer. for those non-unicode reponse , serverResData.toString() should not be your first choice.
     replaceServerResDataAsync: function(req,res,serverResData,callback){
         callback(serverResData);
     },
diff --git a/rule_sample/rule_replace_response_data.js b/rule_sample/rule_replace_response_data.js
index c049ac6..a8ffbe2 100644
--- a/rule_sample/rule_replace_response_data.js
+++ b/rule_sample/rule_replace_response_data.js
@@ -4,6 +4,9 @@ module.exports = {
 
     replaceServerResDataAsync: function(req,res,serverResData,callback){
         //append "hello world" to all web pages
+
+        //for those non-unicode response , serverResData.toString() should not be your first choice.
+        //this issue may help you understanding how to modify an non-unicode response: https://github.com/alibaba/anyproxy/issues/20
         if(/html/i.test(res.headers['content-type'])){
             var newDataStr = serverResData.toString();
             newDataStr += "hello world!";