diff --git a/README.md b/README.md
index 4de2684..575025a 100644
--- a/README.md
+++ b/README.md
@@ -1846,6 +1846,8 @@ through "HTTP proxy" or "SOCKS5 proxy", if the client accesses an http or https
 from the transmitted data. The sniffed domain name will be placed in the `sniff_domain` parameter of the "traffic reporting" 
 API, so the domain name can be obtained through the "traffic reporting" API.
 
+To enable domain name sniffing, you can use the `--sniff-domain` parameter.
+
 ### 6.22 Help
 
 `proxy help sps`
diff --git a/README_ZH.md b/README_ZH.md
index 1deabff..e194670 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -1970,6 +1970,8 @@ iptables -t nat -A OUTPUT -p tcp -j PROXY
 为了避免这种情况，proxy提供了一个域名嗅探功能，当客户端连接SPS代理的时候，无论是通过 “HTTP代理” 还是 “SOCKS5代理”，当客户端访问的是 http 
 或 https 网址的时候，proxy 都会嗅探传输数据中的域名，嗅探到的域名会放在“流量上报”接口的`sniff_domain`参数里面，这样就可以在“流量上报”接口获取域名。
 
+默认情况下，sps的域名嗅探功能是关闭的，如果需要开启，可以通过参数`--sniff-domain`开启。
+
 ### 6.22 查看帮助
 
 `proxy help sps`
diff --git a/docs/manual/manual.md b/docs/manual/manual.md
index bdcd119..68ea7c6 100644
--- a/docs/manual/manual.md
+++ b/docs/manual/manual.md
@@ -1648,6 +1648,8 @@ through "HTTP proxy" or "SOCKS5 proxy", if the client accesses an http or https
 from the transmitted data. The sniffed domain name will be placed in the `sniff_domain` parameter of the "traffic reporting" 
 API, so the domain name can be obtained through the "traffic reporting" API.
 
+To enable domain name sniffing, you can use the `--sniff-domain` parameter.
+
 ### 6.22 Help
 
 `proxy help sps`
diff --git a/docs/manual/zh/manual.md b/docs/manual/zh/manual.md
index 4350980..039f1bc 100644
--- a/docs/manual/zh/manual.md
+++ b/docs/manual/zh/manual.md
@@ -1743,6 +1743,8 @@ iptables -t nat -A OUTPUT -p tcp -j PROXY
 为了避免这种情况，proxy提供了一个域名嗅探功能，当客户端连接SPS代理的时候，无论是通过 “HTTP代理” 还是 “SOCKS5代理”，当客户端访问的是 http 
 或 https 网址的时候，proxy 都会嗅探传输数据中的域名，嗅探到的域名会放在“流量上报”接口的`sniff_domain`参数里面，这样就可以在“流量上报”接口获取域名。
 
+默认情况下，sps的域名嗅探功能是关闭的，如果需要开启，可以通过参数`--sniff-domain`开启。
+
 ### 6.22 查看帮助
 
 `proxy help sps`
diff --git a/docs/sitemap.xml b/docs/sitemap.xml
index c1fad7b..26b0c0f 100644
--- a/docs/sitemap.xml
+++ b/docs/sitemap.xml
@@ -17,6 +17,12 @@
     <lastmod>2019-06-14T16:29:13+08:00</lastmod>
   </url>
   
+  <url>
+    <loc>https://snail007.goproxyauth.com/goproxy/tags/cdn/</loc>
+    <lastmod>2019-07-05T08:20:48+08:00</lastmod>
+    <priority>0</priority>
+  </url>
+  
   <url>
     <loc>https://snail007.goproxyauth.com/goproxy/categories/</loc>
     <lastmod>2019-07-05T08:20:48+08:00</lastmod>
@@ -41,12 +47,6 @@
     <priority>0</priority>
   </url>
   
-  <url>
-    <loc>https://snail007.goproxyauth.com/goproxy/tags/cdn/</loc>
-    <lastmod>2019-07-05T08:20:48+08:00</lastmod>
-    <priority>0</priority>
-  </url>
-  
   <url>
     <loc>https://snail007.goproxyauth.com/goproxy/tags/cloudflare/</loc>
     <lastmod>2019-07-05T08:20:48+08:00</lastmod>
diff --git a/docs/tags/cdn/index.html b/docs/tags/cdn/index.html
index 921a8b2..2e619ce 100644
--- a/docs/tags/cdn/index.html
+++ b/docs/tags/cdn/index.html
@@ -14,7 +14,7 @@
     <link href="//maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet">
     <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
     <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/solarized_dark.min.css">
-    <title>cdn - GOPROXY IN ACTION</title>
+    <title>CDN - GOPROXY IN ACTION</title>
     
     <link href="https://snail007.goproxyauth.com/goproxy/css/styles.css" rel="stylesheet">
     
@@ -77,7 +77,7 @@
 
     
     <header class="page-header">
-      <h1>cdn</h1>
+      <h1>CDN</h1>
     </header>
     
 
diff --git a/docs/tags/cdn/index.xml b/docs/tags/cdn/index.xml
index b6365bc..277430e 100644
--- a/docs/tags/cdn/index.xml
+++ b/docs/tags/cdn/index.xml
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   <channel>
-    <title>cdn on GOPROXY IN ACTION</title>
+    <title>CDN on GOPROXY IN ACTION</title>
     <link>https://snail007.goproxyauth.com/goproxy/tags/cdn/</link>
-    <description>Recent content in cdn on GOPROXY IN ACTION</description>
+    <description>Recent content in CDN on GOPROXY IN ACTION</description>
     <generator>Hugo -- gohugo.io</generator>
     <language>zh-CN</language>
     <lastBuildDate>Fri, 05 Jul 2019 08:20:48 +0800</lastBuildDate>
diff --git a/docs/tags/index.xml b/docs/tags/index.xml
index e06ddc2..7d5472a 100644
--- a/docs/tags/index.xml
+++ b/docs/tags/index.xml
@@ -12,7 +12,7 @@
     
     
     <item>
-      <title>cdn</title>
+      <title>CDN</title>
       <link>https://snail007.goproxyauth.com/goproxy/tags/cdn/</link>
       <pubDate>Fri, 05 Jul 2019 08:20:48 +0800</pubDate>