Add instructions to enable API group to VolumeAttributesClass

content/en/docs/concepts/storage/volume-attributes-classes.md

@@ -11,7 +11,7 @@ weight: 40
 {{< feature-state feature_gate_name="VolumeAttributesClass" >}}
 
 This page assumes that you are familiar with [StorageClasses](/docs/concepts/storage/storage-classes/),
-[Volumes](/docs/concepts/storage/volumes/) and [PersistentVolumes](/docs/concepts/storage/persistent-volumes/)
+[volumes](/docs/concepts/storage/volumes/) and [PersistentVolumes](/docs/concepts/storage/persistent-volumes/)
 in Kubernetes.
 
 <!-- body -->
@@ -29,6 +29,12 @@ If you want to test the feature whilst it's beta, you need to enable the `Volume
 --feature-gates="...,VolumeAttributesClass=true"
 ```
 
+You will also have to enable the `storage.k8s.io/v1beta1` API group through the `kube-apiserver` [runtime-config](https://kubernetes.io/docs/tasks/administer-cluster/enable-disable-api/). You use the following command line argument: 
+
+```
+--runtime-config=storage.k8s.io/v1beta1=true
+```
+
 You can also only use VolumeAttributesClasses with storage backed by
 {{< glossary_tooltip text="Container Storage Interface" term_id="csi" >}}, and only where the
 relevant CSI driver implements the `ModifyVolume` API.
@@ -128,4 +134,4 @@ the parameters may be used depends on the CSI driver implementation.
 Please refer to the related CSI driver documentation for more details.
 
 There can be at most 512 parameters defined for a VolumeAttributesClass.
-The total length of the parameters object including its keys and values cannot exceed 256 KiB.
+The total length of the parameters object including its keys and values cannot exceed 256 KiB.