diff --git a/lib/flake-builders.nix b/lib/flake-builders.nix
index 6893ab2..bea49e4 100644
--- a/lib/flake-builders.nix
+++ b/lib/flake-builders.nix
@@ -100,12 +100,13 @@ in {
           trees));
 
   # This builder's signature is:
-  # [attrset] -> <derivation>
+  # [attrsets] -> <derivation>
+  # Each attrset is a Kubernetes object.
   # The output is a YAML stream of rendered namespaces.
   namespaces = objs:
     lib.builders.yamlStream {
       name = "namespaces";
-      namespace = "CLUSTER";
+      namespace = "CLUSTER"; # ignored in `kubectl create`
       inherit objs;
     };
 }