diff --git a/production/helm/README.md b/production/helm/README.md
index 2e204ef33f45d76fc10a0907d1ca8369a9a49203..36b55906218cb01479bf44d8de4bf2740f9f10b9 100644
--- a/production/helm/README.md
+++ b/production/helm/README.md
@@ -26,7 +26,7 @@ $ helm install . -n loki --namespace <YOUR-NAMESPACE>
 To install Grafana on your cluster with helm, use the following command:
 
 ```bash
-$ helm install stable/grafana -n loki-grafana -f grafana.yaml --namespace <YOUR-NAMESPACE> 
+$ helm install stable/grafana -n loki-grafana -f grafana.yaml --namespace <YOUR-NAMESPACE>
 ```
 
 To get the admin password for the Grafana pod, run the following command:
diff --git a/production/helm/templates/loki/deployment.yaml b/production/helm/templates/loki/deployment.yaml
index d8dab0363723c626de39b478dbeda63b4d175a58..c8dc8bf1a4ab0c1071bf4e20b82bc38af46c63ac 100644
--- a/production/helm/templates/loki/deployment.yaml
+++ b/production/helm/templates/loki/deployment.yaml
@@ -40,7 +40,7 @@ spec:
         - name: {{ .Chart.Name }}
           image: "{{ .Values.loki.image.repository }}:{{ .Values.loki.image.tag }}"
           imagePullPolicy: {{ .Values.loki.image.pullPolicy }}
-          args: 
+          args:
             - "-config.file=/etc/loki/loki.yaml"
           volumeMounts:
             - name: config
diff --git a/production/helm/templates/promtail/clusterrole.yaml b/production/helm/templates/promtail/clusterrole.yaml
index 84bff8d2e3f6e04f2ec446964090c59e20abc240..8a1f20702936a33c04f1d1f76892202d63516b45 100644
--- a/production/helm/templates/promtail/clusterrole.yaml
+++ b/production/helm/templates/promtail/clusterrole.yaml
@@ -19,6 +19,6 @@ rules:
   - nodes/proxy
   - services
   - endpoints
-  - pods  
+  - pods
   verbs: ["get", "watch", "list"]
 {{- end}}
\ No newline at end of file
diff --git a/production/helm/templates/promtail/daemonset.yaml b/production/helm/templates/promtail/daemonset.yaml
index 8da09af44c6de506081f707c6786d8d16b8cd85c..8e897b7016c66797784a5ed21157407458faa4e5 100644
--- a/production/helm/templates/promtail/daemonset.yaml
+++ b/production/helm/templates/promtail/daemonset.yaml
@@ -40,7 +40,7 @@ spec:
         - name: {{ .Chart.Name }}
           image: "{{ .Values.promtail.image.repository }}:{{ .Values.promtail.image.tag }}"
           imagePullPolicy: {{ .Values.promtail.image.pullPolicy }}
-          args: 
+          args:
             - "-config.file=/etc/promtail/promtail.yaml"
             - "-client.url=http://{{ template "loki.fullname" . }}:{{ .Values.loki.service.port }}/api/prom/push"
           volumeMounts:
diff --git a/production/helm/values.yaml b/production/helm/values.yaml
index 4f182706d8799b67505fb1e65a54fff0ef9cc0dd..ae55dfec2d31505a49f5b7c898076ecfbdf3df3b 100644
--- a/production/helm/values.yaml
+++ b/production/helm/values.yaml
@@ -4,9 +4,9 @@ rbac:
 
 serviceAccount:
   create: true
-  name: 
+  name:
 
-loki: 
+loki:
   replicas: 1
   deploymentStrategy: RollingUpdate
 
@@ -58,13 +58,15 @@ loki:
 
   ## Enable persistence using Persistent Volume Claims
   ## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/
-  ##
+  ## If you set enabled as "True", you need :
+  ## - create a pv which above 10Gi and has same namespace with loki
+  ## - keep storageClassName same with below setting
   persistence:
-    enabled: true
+    enabled: false
     accessModes:
       - ReadWriteOnce
     size: 10Gi
-    # storageClassName: default
+    storageClassName: default
     # annotations: {}
     # subPath: ""
     # existingClaim:
@@ -97,7 +99,7 @@ promtail:
 
   image:
     repository: grafana/promtail
-    tag: master 
+    tag: master
     pullPolicy: IfNotPresent
 
   service: