diff --git a/docs/en_US/guide/lxd_custom.md b/docs/en_US/guide/lxd_custom.md
index 6c02e05eee..a55713c588 100644
--- a/docs/en_US/guide/lxd_custom.md
+++ b/docs/en_US/guide/lxd_custom.md
@@ -419,6 +419,4 @@ curl ipv6.ip.sb
 
 ### Principle
 
-Use 6in4's tunnel technology, along with ndpresponder to handle the NDP side of the problem, to solve the problem of forwarding IPV6 networks (/80) across different servers.
-
-Combining https://virt.spiritlhl.net/ or https://www.spiritlhl.net/en_US/ automates the assignment of IPV6 addresses to containers.
\ No newline at end of file
+Use 6in4's tunnel technology, along with ndpresponder to handle the NDP side of the problem, to solve the problem of forwarding IPV6 networks (/80) across different servers.
\ No newline at end of file