diff --git a/README.rst b/README.rst
index 44596bf..1508991 100644
--- a/README.rst
+++ b/README.rst
@@ -43,6 +43,8 @@ Usage
 
 Deploy the janitor into your cluster via (also works with Minikube_):
 
+    Warning: if you want to deploy janitor to namespace other than ``default``, you need to edit ``/deploy/common/rbac.yaml`` first.
+
 .. code-block:: bash
 
     $ kubectl apply -f deploy/common/
diff --git a/deploy/common/rbac.yaml b/deploy/common/rbac.yaml
index 11ce370..39629b0 100644
--- a/deploy/common/rbac.yaml
+++ b/deploy/common/rbac.yaml
@@ -35,4 +35,5 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: kube-janitor
+  # change the namespace name below if you want to deploy to a different namespace
   namespace: default