diff --git a/docs/examples/manual-operation-docs/how_to_config_grub2_password_protection.mkd b/docs/examples/manual-operation-docs/how_to_config_grub2_password_protection.mkd
index 564f1fe..931b540 100644
--- a/docs/examples/manual-operation-docs/how_to_config_grub2_password_protection.mkd
+++ b/docs/examples/manual-operation-docs/how_to_config_grub2_password_protection.mkd
@@ -82,7 +82,7 @@ If add password protection to /etc/grub.d/00_header, maybe you get an error when
 Remember that the correct file to edit is 40_custom simply because other files such as grub.cfg or even 00_header are updated automatically by the system in certain circumstances, and it would make you lose those changes.
 
 ## 6、Reference 
-[https://www.gnu.org/software/grub/manual/grub/html_node/Authentication-and-authorisation.html#Authentication-and-authorisation](https://www.gnu.org/software/grub/manual/grub/html_node/Authentication-and-authorisation.html#Authentication-and-authorisation)
+[https://www.gnu.org/software/grub/manual/grub/html_node/Authentication-and-authorisation.html#Authentication-and-authorisation](https://www.gnu.org/software/grub/manual/grub/html_node/Authentication-and-authorisation.html#Authentication-and-authorisation)    
 [https://help.ubuntu.com/community/Grub2/Passwords](https://help.ubuntu.com/community/Grub2/Passwords)