diff --git a/CHANGES.md b/CHANGES.md
index 18649d5e..c1b0d7d9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -10,6 +10,10 @@ Notable changes between versions.
 
 * Remove optional variable `networking`. Only flannel works on Digital Ocean.
 
+#### Google Cloud
+
+* Add `disk_size` variable for setting instance disk size in GB
+
 ## v1.9.6
 
 * Kubernetes [v1.9.6](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.9.md#v196)
diff --git a/docs/google-cloud.md b/docs/google-cloud.md
index d4a0c421..ea154511 100644
--- a/docs/google-cloud.md
+++ b/docs/google-cloud.md
@@ -256,6 +256,7 @@ resource "google_dns_managed_zone" "zone-for-clusters" {
 | worker_count | Number of workers | 1 | 3 |
 | machine_type | Machine type for compute instances | "n1-standard-1" | See below |
 | os_image | Container Linux image for compute instances | "coreos-stable" | "coreos-stable-1632-3-0-v20180215" |
+| disk_size | Size of the disk in GB | 40 | 100 |
 | worker_preemptible | If enabled, Compute Engine will terminate workers randomly within 24 hours | false | true |
 | controller_clc_snippets | Controller Container Linux Config snippets | [] | |
 | worker_clc_snippets | Worker Container Linux Config snippets | [] | |
diff --git a/google-cloud/container-linux/kubernetes/cluster.tf b/google-cloud/container-linux/kubernetes/cluster.tf
index cd8a0841..5515892d 100644
--- a/google-cloud/container-linux/kubernetes/cluster.tf
+++ b/google-cloud/container-linux/kubernetes/cluster.tf
@@ -10,6 +10,7 @@ module "controllers" {
   count         = "${var.controller_count}"
   machine_type  = "${var.machine_type}"
   os_image      = "${var.os_image}"
+  disk_size     = "${var.disk_size}"
 
   # configuration
   networking            = "${var.networking}"
@@ -31,6 +32,7 @@ module "workers" {
   count        = "${var.worker_count}"
   machine_type = "${var.machine_type}"
   os_image     = "${var.os_image}"
+  disk_size    = "${var.disk_size}"
   preemptible  = "${var.worker_preemptible}"
 
   # configuration
diff --git a/google-cloud/container-linux/kubernetes/controllers/variables.tf b/google-cloud/container-linux/kubernetes/controllers/variables.tf
index c261eb2c..b42bab52 100644
--- a/google-cloud/container-linux/kubernetes/controllers/variables.tf
+++ b/google-cloud/container-linux/kubernetes/controllers/variables.tf
@@ -43,7 +43,7 @@ variable "os_image" {
 variable "disk_size" {
   type        = "string"
   default     = "40"
-  description = "The size of the disk in gigabytes."
+  description = "Size of the disk in GB"
 }
 
 # configuration
diff --git a/google-cloud/container-linux/kubernetes/variables.tf b/google-cloud/container-linux/kubernetes/variables.tf
index 78f3b8ee..46812a2e 100644
--- a/google-cloud/container-linux/kubernetes/variables.tf
+++ b/google-cloud/container-linux/kubernetes/variables.tf
@@ -46,6 +46,12 @@ variable "os_image" {
   description = "Container Linux image for compute instances (e.g. coreos-stable)"
 }
 
+variable "disk_size" {
+  type        = "string"
+  default     = "40"
+  description = "Size of the disk in GB"
+}
+
 variable "worker_preemptible" {
   type        = "string"
   default     = "false"
diff --git a/google-cloud/container-linux/kubernetes/workers/variables.tf b/google-cloud/container-linux/kubernetes/workers/variables.tf
index 70bf80cb..59ccfe9f 100644
--- a/google-cloud/container-linux/kubernetes/workers/variables.tf
+++ b/google-cloud/container-linux/kubernetes/workers/variables.tf
@@ -43,7 +43,7 @@ variable "os_image" {
 variable "disk_size" {
   type        = "string"
   default     = "40"
-  description = "The size of the disk in gigabytes."
+  description = "Size of the disk in GB"
 }
 
 variable "preemptible" {