diff --git a/README.md b/README.md
index 3429dda..7afa901 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,6 @@ to make changes validating!
 
 ## Defects:
 - Debian preseeding process can only config one IP address, so to bio-stack machine(both have IPv4 and IPv6 address), after loggin to new system, you can only see IPv4 address are configurated, you have to config IPv6 address manually.
-<br />
 edit network interfaces:
 <br />
 <br />
@@ -32,9 +31,8 @@ add ipv6 configurations:
         dns-nameservers 2606:4700:4700:0:0:0:0:6400</code></pre>
 In above sample, you just need to change "::1" to your own IPv6 address which assigned by your cloud provider. "netmask" 64 is a typical value, "dns-nameservers" is from Cloudflare.com.
 <br />
-<br />
 Save files and restart system.
-
+<br />
 - "InstallNET.sh" doesn't support pure IPv6 stack machine(have no IPv4 address, such as Vultr.com 2.5$/month plan).
 
 ## Download: