diff --git a/README.md b/README.md
index 38fac85..e731d50 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,7 @@ Many thanks to [the contributors listed here](https://github.com/terraform-aws-m
 
 MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-aws-eks/tree/master/LICENSE) for full details.
 
+
 ## Inputs
 
 | Name | Description | Type | Default | Required |
@@ -102,7 +103,10 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 | kubeconfig_aws_authenticator_additional_args | Any additional arguments to pass to the authenticator such as the role to assume ["-r", "MyEksRole"] | string | `<list>` | no |
 | kubeconfig_aws_authenticator_command | Command to use to to fetch AWS EKS credentials | string | `heptio-authenticator-aws` | no |
 | kubeconfig_aws_authenticator_env_variables | Environment variables that should be used when executing the authenticator i.e. { AWS_PROFILE = "eks"} | string | `<map>` | no |
-| kubeconfig_name | Override the default name used for items kubeconfig. | string | `` | no |
+| kubeconfig_name | Override the default name used for items kubeconfig | string | `` | no |
+| root_iops | The amount of provisioned IOPS. This must be set with a volume_type of 'io1'. | string | `` | no |
+| root_volume_size | The root size of the volume in gigabytes. | string | `20` | no |
+| root_volume_type | The type of root volume. Can be 'standard', 'gp2', or 'io1' | string | `gp2` | no |
 | subnets | A list of subnets to place the EKS cluster and workers within. | list | - | yes |
 | tags | A map of tags to add to all resources. | string | `<map>` | no |
 | vpc_id | VPC where the cluster and workers will be deployed. | string | - | yes |
@@ -126,3 +130,4 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 | worker_iam_role_name | IAM role name attached to EKS workers |
 | worker_security_group_id | Security group ID attached to the EKS workers. |
 | workers_asg_arns | IDs of the autoscaling groups containing workers. |
+
diff --git a/variables.tf b/variables.tf
index 1302a48..c73ae3c 100644
--- a/variables.tf
+++ b/variables.tf
@@ -41,6 +41,21 @@ variable "vpc_id" {
   description = "VPC where the cluster and workers will be deployed."
 }
 
+variable "root_volume_size" {
+  description = "The root size of the volume in gigabytes."
+  default     = "20"
+}
+
+variable "root_volume_type" {
+  description = "The type of root volume. Can be 'standard', 'gp2', or 'io1'"
+  default     = "gp2"
+}
+
+variable "root_iops" {
+  description = "The amount of provisioned IOPS. This must be set with a volume_type of 'io1'."
+  default     = ""
+}
+
 variable "worker_groups" {
   description = "A list of maps defining worker group configurations. See workers_group_defaults for valid keys."
   type        = "list"
diff --git a/workers.tf b/workers.tf
index e83412f..2d55ae2 100644
--- a/workers.tf
+++ b/workers.tf
@@ -37,6 +37,9 @@ resource "aws_launch_configuration" "workers" {
   }
 
   root_block_device {
+    volume_size           = "${var.root_volume_size}"
+    volume_type           = "${var.root_volume_type}"
+    iops                  = "${var.root_iops}"
     delete_on_termination = true
   }
 }