diff --git a/kube-jupyterhub.md b/kube-jupyterhub.md
index 3a595ca86db4153765c384062371c42e91c439ae..d9641a11f5fe178d045345ea3918ee3ee4dfa872 100644
--- a/kube-jupyterhub.md
+++ b/kube-jupyterhub.md
@@ -18,6 +18,18 @@ The new installed helm in /root/bin
 helm version
 version.BuildInfo{Version:"v3.5.0", GitCommit:"32c22239423b3b4ba6706d450bd044baffdcf9e6", GitTreeState:"clean", GoVersion:"go1.15.6"}
 
+The creation of volumes required by kube app can achieved if :
+csi-cinder-controllerplugin + csi-cinder-nodeplugin pods are running
+and if a dedicated storage class is created
+
+cat storageclass.yaml 
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: csi-sc-cinderplugin
+parameters:
+  type: __DEFAULT__
+provisioner: cinder.csi.openstack.org
 
 
 ```
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