@@ -119,7 +119,8 @@ You can also extend the chain by mounting the volume that came from the

 If you remove containers that mount volumes, including the initial `dbdata`

 container, or the subsequent containers `db1` and `db2`, the volumes will not

-be deleted until there are no containers still referencing those volumes. This

+be deleted.  To delete the volume from disk, you must explicitly call

+`docker rm -v` against the last container with a reference to the volume. This

 allows you to upgrade, or effectively migrate data volumes between containers.

 ## Backup, restore, or migrate data volumes