diff --git a/docs/index.md b/docs/index.md
index 00354cf9d0..eb2c15d7a9 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1384,6 +1384,7 @@ Options:
  - `--openstack-password`: User password. It can be omitted if the standard environment variable `OS_PASSWORD` is set.
  - `--openstack-tenant-name` or `--openstack-tenant-id`: Identify the tenant in which the machine will be created.
  - `--openstack-region`: The region to work on. Can be omitted if there is only one region on the OpenStack.
+ - `--openstack-availability-zone`: The availability zone in which to launch the server.
  - `--openstack-endpoint-type`: Endpoint type can be `internalURL`, `adminURL` on `publicURL`. If is a helper for the driver
    to choose the right URL in the OpenStack service catalog. If not provided the default id `publicURL`
  - `--openstack-net-name` or `--openstack-net-id`: Identify the private network the machine will be connected on. If your OpenStack project project contains only one private network it will be use automatically.
@@ -1397,28 +1398,29 @@ Options:
 
 Environment variables and default values:
 
-| CLI option                    | Environment variable | Default |
-|-------------------------------|----------------------|---------|
-| `--openstack-auth-url`        | `OS_AUTH_URL`        | -       |
-| `--openstack-flavor-name`     | -                    | -       |
-| `--openstack-flavor-id`       | -                    | -       |
-| `--openstack-image-name`      | -                    | -       |
-| `--openstack-image-id`        | -                    | -       |
-| `--openstack-insecure`        | -                    | -       |
-| `--openstack-domain-name`     | `OS_DOMAIN_NAME`     | -       |
-| `--openstack-domain-id`       | `OS_DOMAIN_ID`       | -       |
-| `--openstack-username`        | `OS_USERNAME`        | -       |
-| `--openstack-password`        | `OS_PASSWORD`        | -       |
-| `--openstack-tenant-name`     | `OS_TENANT_NAME`     | -       |
-| `--openstack-tenant-id`       | `OS_TENANT_ID`       | -       |
-| `--openstack-region`          | `OS_REGION_NAME`     | -       |
-| `--openstack-endpoint-type`   | `OS_ENDPOINT_TYPE`   | -       |
-| `--openstack-net-name`        | -                    | -       |
-| `--openstack-net-id`          | -                    | -       |
-| `--openstack-sec-groups`      | -                    | -       |
-| `--openstack-floatingip-pool` | -                    | -       |
-| `--openstack-ssh-user`        | -                    | `root`  |
-| `--openstack-ssh-port`        | -                    | `22`    |
+| CLI option                       | Environment variable   | Default |
+|----------------------------------|------------------------|---------|
+| `--openstack-auth-url`           | `OS_AUTH_URL`          | -       |
+| `--openstack-flavor-name`        | -                      | -       |
+| `--openstack-flavor-id`          | -                      | -       |
+| `--openstack-image-name`         | -                      | -       |
+| `--openstack-image-id`           | -                      | -       |
+| `--openstack-insecure`           | -                      | -       |
+| `--openstack-domain-name`        | `OS_DOMAIN_NAME`       | -       |
+| `--openstack-domain-id`          | `OS_DOMAIN_ID`         | -       |
+| `--openstack-username`           | `OS_USERNAME`          | -       |
+| `--openstack-password`           | `OS_PASSWORD`          | -       |
+| `--openstack-tenant-name`        | `OS_TENANT_NAME`       | -       |
+| `--openstack-tenant-id`          | `OS_TENANT_ID`         | -       |
+| `--openstack-region`             | `OS_REGION_NAME`       | -       |
+| `--openstack-availability-zone`  | `OS_AVAILABILITY_ZONE` | -       |
+| `--openstack-endpoint-type`      | `OS_ENDPOINT_TYPE`     | -       |
+| `--openstack-net-name`           | -                      | -       |
+| `--openstack-net-id`             | -                      | -       |
+| `--openstack-sec-groups`         | -                      | -       |
+| `--openstack-floatingip-pool`    | -                      | -       |
+| `--openstack-ssh-user`           | -                      | `root`  |
+| `--openstack-ssh-port`           | -                      | `22`    |
 
 #### Rackspace
 Create machines on [Rackspace cloud](http://www.rackspace.com/cloud)