diff --git a/docs/sources/reference/components/mimir.rules.kubernetes.md b/docs/sources/reference/components/mimir.rules.kubernetes.md
index 7db6dd2d3f..1e52cb2621 100644
--- a/docs/sources/reference/components/mimir.rules.kubernetes.md
+++ b/docs/sources/reference/components/mimir.rules.kubernetes.md
@@ -24,6 +24,15 @@ in Kubernetes in order for {{< param "PRODUCT_NAME" >}} to access it via the Kub
 [Role-based access control (RBAC)]: https://kubernetes.io/docs/reference/access-authn-authz/rbac/
 {{< /admonition >}}
 
+{{< admonition type="warning" >}}
+This component does not support [clustered mode][]. Using this component as part of a cluster of 
+{{< param "PRODUCT_NAME" >}} instances will cause them to all attempt to update rules using the
+Mimir API, conflicting with each other. When using this component, it must be run in a separate
+single-instance deployment of {{< param "PRODUCT_NAME" >}}.
+
+[clustered mode]: ../../../concepts/clustering/
+{{< /admonition >}}
+
 [Kubernetes label selectors]: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors
 [prometheus-operator]: https://prometheus-operator.dev/
 [within a Pod]: https://kubernetes.io/docs/tasks/run-application/access-api-from-pod/