diff --git a/hosts/fw.cloonar.com/modules/staticids.nix b/hosts/fw.cloonar.com/modules/staticids.nix
index 38a545c..f38e7ab 100644
--- a/hosts/fw.cloonar.com/modules/staticids.nix
+++ b/hosts/fw.cloonar.com/modules/staticids.nix
@@ -5,6 +5,7 @@ in
 {
   options.cids = {
     uids = lib.mkOption {
+      readOnly = true;
       description = lib.mdDoc ''
         The user IDs used for containers.
       '';
@@ -12,6 +13,7 @@ in
     };
 
     gids = lib.mkOption {
+      readOnly = true;
       description = lib.mdDoc ''
         The group IDs used for containers.
       '';