@@ -159,7 +159,8 @@ Docker needs reminding of the path to the volume on the host.

 ```

 Respond with the path on the host filesystem where the volume has been made

-available, and/or a string error if an error occurred.

+available, and/or a string error if an error occurred. `Mountpoint` is optional,

+however the plugin may be queried again later if one is not provided.

 ### /VolumeDriver.Unmount

@@ -211,7 +212,8 @@ Get the volume info.

 }

 ```

-Respond with a string error if an error occurred.

+Respond with a string error if an error occurred. `Mountpoint` and `Status` are

+optional.

 ### /VolumeDriver.List

@@ -236,7 +238,7 @@ Get the list of volumes registered with the plugin.

 }

 ```

-Respond with a string error if an error occurred.

+Respond with a string error if an error occurred. `Mountpoint` is optional.

 ### /VolumeDriver.Capabilities