diff --git a/configuration.nix b/configuration.nix
index d9dda4c..f84babc 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -267,7 +267,8 @@
     disableRegistration = false;
     settings = {
       security.LOGIN_REMEMBER_DAYS = 365;
-      attachment.MAX_SIZE = 10;
+      attachment.MAX_SIZE = 10;  # file upload size (MB)
+      service.DEFAULT_ALLOW_CREATE_ORGANIZATION = false;
     };
   };