diff --git a/sources/tech/How to set up a secondary DNS server in CentOS.md b/sources/tech/How to set up a secondary DNS server in CentOS.md
index 2aaa0d0095..81bef24e31 100644
--- a/sources/tech/How to set up a secondary DNS server in CentOS.md	
+++ b/sources/tech/How to set up a secondary DNS server in CentOS.md	
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+[zzlyzq translating]
 How to set up a secondary DNS server in CentOS
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 In the [previous tutorial][1], we created a primary DNS server (ns1) for a test domain example.tst. In this tutorial, we will create a secondary DNS server (ns2) for the same domain by using bind package on CentOS.
@@ -184,4 +185,4 @@ via: http://xmodulo.com/2014/04/secondary-dns-server-centos.html
 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
 
 [1]:http://xmodulo.com/2014/04/primary-dns-server-using-centos.html
-[2]:http://xmodulo.com/2014/04/primary-dns-server-using-centos.html
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+[2]:http://xmodulo.com/2014/04/primary-dns-server-using-centos.html