diff --git a/meta/dns.nix b/meta/dns.nix
index 534b5fe..9df516a 100644
--- a/meta/dns.nix
+++ b/meta/dns.nix
@@ -131,8 +131,9 @@ let
         ];
 
         web02.dual = [
-          "cas-eleves"
-          "vote"
+          "cas-eleves" # CAS server
+          "chat" # Mattermost
+          "vote" # Kadenios
         ];
 
         web03.dual = [