diff --git a/modules/node_groups/README.md b/modules/node_groups/README.md
index 1ac6612eab..2aa2aa8a2b 100644
--- a/modules/node_groups/README.md
+++ b/modules/node_groups/README.md
@@ -40,6 +40,8 @@ The role ARN specified in `var.default_iam_role_arn` will be used by default. In
 | launch\_template_version | The version of the LT to use | string | none |
 | max\_capacity | Max number of workers | number | `var.workers_group_defaults[asg_max_size]` |
 | min\_capacity | Min number of workers | number | `var.workers_group_defaults[asg_min_size]` |
+| max\_unavailable\_type | Type of the max number unavailable nodes. Can be `number` or `percent`. | string | `update_config` block not added |
+| max\_unavailable | Value for max unavailable nodes.  | number | Cannot be empty if `max_unavailable_type` is set |
 | name | Name of the node group. If you don't really need this, we recommend you to use `name_prefix` instead. | string | Will use the autogenerate name prefix |
 | name_prefix | Name prefix of the node group | string | Auto generated |
 | pre_userdata | userdata to pre-append to the default userdata. Require `create_launch_template` to be `true`| string | "" |