diff --git a/clusters/k8s-avroid-office.prod.local/namespaces/kube-prometheus-stack/kube-prometheus-stack/argocd-apps-kube-prometheus-stack-app.yaml b/clusters/k8s-avroid-office.prod.local/namespaces/kube-prometheus-stack/kube-prometheus-stack/argocd-apps-kube-prometheus-stack-app.yaml
index 193da41..375269d 100644
--- a/clusters/k8s-avroid-office.prod.local/namespaces/kube-prometheus-stack/kube-prometheus-stack/argocd-apps-kube-prometheus-stack-app.yaml
+++ b/clusters/k8s-avroid-office.prod.local/namespaces/kube-prometheus-stack/kube-prometheus-stack/argocd-apps-kube-prometheus-stack-app.yaml
@@ -68,3 +68,7 @@ spec:
       kind: ServiceMonitor
     - group: '*'
       kind: Prometheus
+  # When using Applications-in-any-namespace, this field determines which namespaces this AppProject permits
+  # Applications to reside in. Details: https://argo-cd.readthedocs.io/en/stable/operator-manual/app-any-namespace/
+  sourceNamespaces:
+    - "kube-system"