diff --git a/Extension-A.md b/Extension-A.md
index 5fb6c52..4e9732e 100644
--- a/Extension-A.md
+++ b/Extension-A.md
@@ -7,7 +7,7 @@ ipv6 access-list SSH_ONLY_FROM_HH
  permit tcp 2001:db8:1000:10::/64 any eq 22
  deny tcp any any eq 22
  permit ipv6 any any
-interface GigabitEthernet0/0
+interface GigabitEthernet0/0/0
  ipv6 traffic-filter SSH_ONLY_FROM_HH in
 
 ```