diff --git a/docs/index.md b/docs/index.md
index fc9548a05b..c6ef164351 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1067,7 +1067,6 @@ Environment variables and default values:
 | `--amazonec2-monitoring`            | -                       | `false`          |
 
 #### Digital Ocean
-
 Create Docker machines on [Digital Ocean](https://www.digitalocean.com/).
 
 You need to create a personal access token under "Apps & API" in the Digital Ocean
@@ -1077,16 +1076,28 @@ Control Panel and pass that to `docker-machine create` with the `--digitalocean-
 
 Options:
 
- - `--digitalocean-access-token`: Your personal access token for the Digital Ocean API.
- - `--digitalocean-image`: The name of the Digital Ocean image to use. Default: `docker`
- - `--digitalocean-region`: The region to create the droplet in, see [Regions API](https://developers.digitalocean.com/documentation/v2/#regions) for how to get a list. Default: `nyc3`
- - `--digitalocean-size`: The size of the Digital Ocean droplet (larger than default options are of the form `2gb`). Default: `512mb`
- - `--digitalocean-ipv6`: Enable IPv6 support for the droplet. Default: `false`
- - `--digitalocean-private-networking`: Enable private networking support for the droplet. Default: `false`
- - `--digitalocean-backups`: Enable Digital Oceans backups for the droplet. Default: `false`
+ - `--digitalocean-access-token`: **required** Your personal access token for the Digital Ocean API.
+ - `--digitalocean-image`: The name of the Digital Ocean image to use.
+ - `--digitalocean-region`: The region to create the droplet in, see [Regions API](https://developers.digitalocean.com/documentation/v2/#regions) for how to get a list.
+ - `--digitalocean-size`: The size of the Digital Ocean droplet (larger than default options are of the form `2gb`).
+ - `--digitalocean-ipv6`: Enable IPv6 support for the droplet.
+ - `--digitalocean-private-networking`: Enable private networking support for the droplet.
+ - `--digitalocean-backups`: Enable Digital Oceans backups for the droplet.
 
 The DigitalOcean driver will use `ubuntu-14-04-x64` as the default image.
 
+Environment variables and default values:
+
+| CLI option                          | Environment variable              | Default  |
+|-------------------------------------|-----------------------------------|----------|
+| **`--digitalocean-access-token`**   | `DIGITALOCEAN_ACCESS_TOKEN`       | -        |
+| `--digitalocean-image`              | `DIGITALOCEAN_IMAGE`              | `docker` |
+| `--digitalocean-region`             | `DIGITALOCEAN_REGION`             | `nyc3`   |
+| `--digitalocean-size`               | `DIGITALOCEAN_SIZE`               | `512mb`  |
+| `--digitalocean-ipv6`               | `DIGITALOCEAN_IPV6`               | `false`  |
+| `--digitalocean-private-networking` | `DIGITALOCEAN_PRIVATE_NETWORKING` | `false`  |
+| `--digitalocean-backups`            | `DIGITALOCEAN_BACKUPS`            | `false`  |
+
 #### Generic
 Create machines using an existing VM/Host with SSH.