diff --git a/README.md b/README.md
index 06c889fc2..37fe8c002 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ Crane use prometheus to be the default metric provider. Using following command
 helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
 helm repo update
 
-helm install $RELEASE_NAME -n $NAMESPACE --set kubeStateMetrics.enabled=false --create-namespace  prometheus-community/prometheus
+helm install $RELEASE_NAME -n $NAMESPACE --set kubeStateMetrics.enabled=false --set persistentVolume.enabled=false --create-namespace  prometheus-community/prometheus
 helm install node-exporter-$RELEASE_NAME -n $NAMESPACE --create-namespace  prometheus-community/prometheus-node-exporter
 
 if [ ! $CUSTOMIZE_PROMETHEUS ]; then sed -i '' "s/PROMETHEUS_ADDRESS/http:\/\/${RELEASE_NAME}-prometheus-server.${NAMESPACE}.svc.cluster.local/" deploy/craned/deployment.yaml ; else sed -i '' "s/PROMETHEUS_ADDRESS/${CUSTOMIZE_PROMETHEUS}/" deploy/craned/deployment.yaml ; fi