diff --git a/README.md b/README.md
index 0b36ef9..009ac3d 100644
--- a/README.md
+++ b/README.md
@@ -142,7 +142,7 @@ Available targets:
 | <a name="input_attributes"></a> [attributes](#input\_attributes) | ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`,<br/>in the order they appear in the list. New attributes are appended to the<br/>end of the list. The elements of the list are joined by the `delimiter`<br/>and treated as a single ID element. | `list(string)` | `[]` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br/>See description of individual variables for details.<br/>Leave string and numeric variables as `null` to use default value.<br/>Individual variable settings (non-null) override settings in context object,<br/>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br/>  "additional_tag_map": {},<br/>  "attributes": [],<br/>  "delimiter": null,<br/>  "descriptor_formats": {},<br/>  "enabled": true,<br/>  "environment": null,<br/>  "id_length_limit": null,<br/>  "label_key_case": null,<br/>  "label_order": [],<br/>  "label_value_case": null,<br/>  "labels_as_tags": [<br/>    "unset"<br/>  ],<br/>  "name": null,<br/>  "namespace": null,<br/>  "regex_replace_chars": null,<br/>  "stage": null,<br/>  "tags": {},<br/>  "tenant": null<br/>}</pre> | no |
 | <a name="input_customer_gateway_bgp_asn"></a> [customer\_gateway\_bgp\_asn](#input\_customer\_gateway\_bgp\_asn) | The Customer Gateway's Border Gateway Protocol (BGP) Autonomous System Number (ASN) | `number` | `65000` | no |
-| <a name="input_customer_gateway_device_name"></a> [customer\_gateway\_device\_name](#input\_customer\_gateway\_device\_name) | The Device Name of the Customer Gateway | `string` | `null` | no |
+| <a name="input_customer_gateway_device_name"></a> [customer\_gateway\_device\_name](#input\_customer\_gateway\_device\_name) | The Device Name of the Customer Gateway | `string` | `""` | no |
 | <a name="input_customer_gateway_ip_address"></a> [customer\_gateway\_ip\_address](#input\_customer\_gateway\_ip\_address) | The IP address of the Customer Gateway's Internet-routable external interface. Set to `null` to not create the Customer Gateway | `string` | `null` | no |
 | <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements.<br/>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
 | <a name="input_descriptor_formats"></a> [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map.<br/>Map of maps. Keys are names of descriptors. Values are maps of the form<br/>`{<br/>   format = string<br/>   labels = list(string)<br/>}`<br/>(Type is `any` so the map values can later be enhanced to provide additional options.)<br/>`format` is a Terraform format string to be passed to the `format()` function.<br/>`labels` is a list of labels, in order, to pass to `format()` function.<br/>Label values will be normalized before being passed to `format()` so they will be<br/>identical to how they appear in `id`.<br/>Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |