Merge pull request #476 from alexisbellido/master

Clarify the fact that VOLUME does not support host-dir

Author: Misty Stanley-Jones

engine/tutorials/dockervolumes.md

@@ -154,10 +154,12 @@ Here you've mounted the same `/src/webapp` directory but you've added the `ro`
 option to specify that the mount should be read-only.
 
 >**Note**: The host directory is, by its nature, host-dependent. For this
->reason, you can't mount a host directory from `Dockerfile` because built images
+>reason, you can't mount a host directory from `Dockerfile`, the `VOLUME`
+instruction does not support passing a `host-dir`, because built images
 >should be portable. A host directory wouldn't be available on all potential
 >hosts.
 
+
 ### Mount a shared-storage volume as a data volume
 
 In addition to mounting a host directory in your container, some Docker