diff --git a/content/rancher/v2.x/en/cluster-admin/tools/monitoring/_index.md b/content/rancher/v2.x/en/cluster-admin/tools/monitoring/_index.md
index 9e9703a2d32..c2618dd8d03 100644
--- a/content/rancher/v2.x/en/cluster-admin/tools/monitoring/_index.md
+++ b/content/rancher/v2.x/en/cluster-admin/tools/monitoring/_index.md
@@ -47,6 +47,8 @@ Using Prometheus, you can monitor Rancher at both the cluster level and [project
 
 As an [administrator]({{<baseurl>}}/rancher/v2.x/en/admin-settings/rbac/global-permissions/) or [cluster owner]({{<baseurl>}}/rancher/v2.x/en/admin-settings/rbac/cluster-project-roles/#cluster-roles), you can configure Rancher to deploy Prometheus to monitor your Kubernetes cluster.
 
+> **Prerequisite:** Make sure that you are allowing traffic on port 9796 for each of your nodes because Prometheus will scrape metrics from here.
+
 1. From the **Global** view, navigate to the cluster that you want to configure cluster monitoring.
 
 1. Select **Tools > Monitoring** in the navigation bar.
@@ -98,4 +100,4 @@ Pod | CPU (milli CPU) | Memory (MB)
 Node Exporter (Per Node) | 100 | 30
 Kube State Cluster Monitor | 100 | 130
 Grafana | 100 | 150
-Prometheus Cluster Monitoring Nginx | 50 | 50
\ No newline at end of file
+Prometheus Cluster Monitoring Nginx | 50 | 50