diff --git a/hosts/vm/neo/matrix.nix b/hosts/vm/neo/matrix.nix
index 140f4f8..feb3b62 100644
--- a/hosts/vm/neo/matrix.nix
+++ b/hosts/vm/neo/matrix.nix
@@ -134,6 +134,8 @@
         "/var/lib/matrix-appservice-irc/registration.yml"
       ];
 
+      auto_join_rooms = [ "#root-space:crans.org" ];
+
       # https://element-hq.github.io/synapse/latest/server_notices.html
       server_notices = {
         system_mxid_localpart = "annonces";