Code review comments.

Author: dhirajh

docs/concepts/storage/volumes.md

@@ -543,6 +543,7 @@ metadata:
 spec:
   capacity:
     storage: 100Gi
+  # volumeMode property requires BlockVolume Alpha feature gate to be enabled.
   volumeMode: Filesystem
   accessModes:
   - ReadWriteOnce
@@ -565,7 +566,8 @@ the Kubernetes scheduler to correctly schedule pods using local volumes to the
 correct node.
 
 PersistentVolume `volumeMode` can now be set to "Block" (instead of the default
-value "Filesystem") to expose the local volume as a raw block device.
+value "Filesystem") to expose the local volume as a raw block device. The
+`volumeMode` property requires `BlockVolume` Alpha feature gate to be enabled.
 
 When using local volumes, it is recommended to create a StorageClass with
 `volumeBindingMode` set to `WaitForFirstConsumer`. See the