be explicit on Atomic VirtualBox instruction

Signed-off-by: Huamin Chen <hchen@redhat.com>

diff --git a/README.md b/README.md
index d15b4bc4fb1440b36932d2f32add602e5fb01a3d..20974e0b2806c5c50b636b31563fd928430c5dd8 100644 (file)
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ Attention, ceph-common doesn't manage backports repository, you must add it your
 If you want to run containerized deployment on Atomic systems (RHEL/CentOS Atomic), please copy
 [vagrant.yml.atomic](vagrant_variables.yml.atomic) to vagrant_variables.yml, and copy [group_vars/all.docker](group_vars/all.docker) to `group_vars/all`.
 
-Since `centos/atomic-host` doesn't have spare storage controller to attach more disks, it is likely the first time `vagrant up --provider=virtualbox` runs, it will fail to attach to a storage controller. In such case, run the following command:
+Since `centos/atomic-host` VirtualBox box doesn't have spare storage controller to attach more disks, it is likely the first time `vagrant up --provider=virtualbox` runs, it will fail to attach to a storage controller. In such case, run the following command:
 
 ```console
 VBoxManage storagectl `VBoxManage list vms |grep ceph-ansible_osd0|awk '{print $1}'|tr \" ' '` --name "SATA" --add sata