diff --git a/docs/cinder-csi.md b/docs/cinder-csi.md
index b7dadf1e4..b1cd6f836 100644
--- a/docs/cinder-csi.md
+++ b/docs/cinder-csi.md
@@ -93,6 +93,8 @@ kubectl exec -it nginx -- df -h | grep /var/lib/www/html
 It is not necessary to enable OpenStack as a cloud provider for Cinder CSI Driver to work.
 Though, you can run both the in-tree openstack cloud provider and the Cinder CSI Driver at the same time. The storage class provisioners associated to each one of them are differently named.
 
+When using the in-tree OpenStack cloud provider with an external CA certificate, Cinder will not use the external CA certificate set by base64 encoding the cacert file and storing it in the variable `openstack_cacert`, it will use the `OS_CACERT = <path_to_external_cacert>` in your openrc.
+
 ## Cinder v2 support
 
 For the moment, only Cinder v3 is supported by the CSI Driver.
diff --git a/docs/openstack.md b/docs/openstack.md
index 189592e51..2ecfa9dbe 100644
--- a/docs/openstack.md
+++ b/docs/openstack.md
@@ -109,6 +109,7 @@ The new cloud provider is configured to have Octavia by default in Kubespray.
   ```
 
 - Run `source path/to/your/openstack-rc` to read your OpenStack credentials like `OS_AUTH_URL`, `OS_USERNAME`, `OS_PASSWORD`, etc. Those variables are used for accessing OpenStack from the external cloud provider.
+- If you are using an external OpenStack CA certificate, you will need to set `OS_CACERT = <path_to_external_cacert>` in your openrc.
 - Run the `cluster.yml` playbook
 
 ## Additional step needed when using calico or kube-router