diff --git a/docs/k3s-cluster.md b/docs/k3s-cluster.md
index 4cdc51e..29fe0a2 100644
--- a/docs/k3s-cluster.md
+++ b/docs/k3s-cluster.md
@@ -78,3 +78,9 @@ cat /var/lib/rancher/k3s/server/node-token
 # install k3s as agent / worker node
 curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="agent --server https://casa.dev.lan:6443 --token <TOKEN>" sh -s -
 ```
+
+**Set node labels:**
+
+``` bash
+kubectl label node casa-minion-01 role=worker-node
+```
diff --git a/monitoring/prometheus/deploy/prometheus-agent.yaml b/monitoring/prometheus/deploy/prometheus-agent.yaml
index 501138b..96c54db 100644
--- a/monitoring/prometheus/deploy/prometheus-agent.yaml
+++ b/monitoring/prometheus/deploy/prometheus-agent.yaml
@@ -25,8 +25,10 @@ spec:
       memory: 128Mi
     limits:
       cpu: 200m
-      memory: 180Mi
+      memory: 256Mi
   serviceAccountName: prometheus-agent
+  nodeSelector:
+    role: worker-node
 ---
 
 apiVersion: rbac.authorization.k8s.io/v1