diff --git a/CHANGES.md b/CHANGES.md
index 1e1974b7..99eaebc6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -25,6 +25,7 @@ Notable changes between versions.
 
 #### DigitalOcean
 
+* Add Terraform v0.12 variables types ([#560](https://github.com/poseidon/typhoon/pull/560))
 * Fix Terraform missing comma error ([#549](https://github.com/poseidon/typhoon/pull/549))
 
 #### Google Cloud
diff --git a/digital-ocean/container-linux/kubernetes/variables.tf b/digital-ocean/container-linux/kubernetes/variables.tf
index fbd6df51..cf8a1ab1 100644
--- a/digital-ocean/container-linux/kubernetes/variables.tf
+++ b/digital-ocean/container-linux/kubernetes/variables.tf
@@ -18,33 +18,33 @@ variable "dns_zone" {
 # instances
 
 variable "controller_count" {
-  type        = string
-  default     = "1"
+  type        = number
   description = "Number of controllers (i.e. masters)"
+  default     = 1
 }
 
 variable "worker_count" {
-  type        = string
-  default     = "1"
+  type        = number
   description = "Number of workers"
+  default     = 1
 }
 
 variable "controller_type" {
   type        = string
-  default     = "s-2vcpu-2gb"
   description = "Droplet type for controllers (e.g. s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb)."
+  default     = "s-2vcpu-2gb"
 }
 
 variable "worker_type" {
   type        = string
-  default     = "s-1vcpu-2gb"
   description = "Droplet type for workers (e.g. s-1vcpu-2gb, s-2vcpu-2gb)"
+  default     = "s-1vcpu-2gb"
 }
 
 variable "image" {
   type        = string
-  default     = "coreos-stable"
   description = "Container Linux image for instances (e.g. coreos-stable)"
+  default     = "coreos-stable"
 }
 
 variable "controller_clc_snippets" {
@@ -67,48 +67,48 @@ variable "ssh_fingerprints" {
 }
 
 variable "asset_dir" {
-  description = "Path to a directory where generated assets should be placed (contains secrets)"
   type        = string
+  description = "Absolute path to a directory where generated assets should be placed (contains secrets)"
 }
 
 variable "networking" {
-  description = "Choice of networking provider (flannel or calico)"
   type        = string
+  description = "Choice of networking provider (flannel or calico)"
   default     = "flannel"
 }
 
 variable "pod_cidr" {
-  description = "CIDR IPv4 range to assign Kubernetes pods"
   type        = string
+  description = "CIDR IPv4 range to assign Kubernetes pods"
   default     = "10.2.0.0/16"
 }
 
 variable "service_cidr" {
+  type = string
   description = <<EOD
 CIDR IPv4 range to assign Kubernetes services.
 The 1st IP will be reserved for kube_apiserver, the 10th IP will be reserved for coredns.
 EOD
-
-
-  type = string
   default = "10.3.0.0/16"
 }
 
-variable "cluster_domain_suffix" {
-  description = "Queries for domains with the suffix will be answered by coredns. Default is cluster.local (e.g. foo.default.svc.cluster.local) "
-  type = string
-  default = "cluster.local"
-}
-
 variable "enable_reporting" {
-  type = string
+  type = bool
   description = "Enable usage or analytics reporting to upstreams (Calico)"
-  default = "false"
+  default = false
 }
 
 variable "enable_aggregation" {
+  type = bool
   description = "Enable the Kubernetes Aggregation Layer (defaults to false)"
-  type = string
-  default = "false"
+  default = false
+}
+
+# unofficial, undocumented, unsupported
+
+variable "cluster_domain_suffix" {
+  type = string
+  description = "Queries for domains with the suffix will be answered by coredns. Default is cluster.local (e.g. foo.default.svc.cluster.local) "
+  default = "cluster.local"
 }
 
diff --git a/docs/cl/azure.md b/docs/cl/azure.md
index f4dc8cad..f3c65460 100644
--- a/docs/cl/azure.md
+++ b/docs/cl/azure.md
@@ -221,7 +221,7 @@ Reference the DNS zone with `azurerm_dns_zone.clusters.name` and its resource gr
 | worker_priority | Set priority to Low to use reduced cost surplus capacity, with the tradeoff that instances can be deallocated at any time | Regular | Low |
 | controller_clc_snippets | Controller Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
 | worker_clc_snippets | Worker Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
-| networking | Choice of networking provider | "flannel" | "flannel" or "calico" (experimental) |
+| networking | Choice of networking provider | "flannel" | "flannel" or "calico" |
 | host_cidr | CIDR IPv4 range to assign to instances | "10.0.0.0/16" | "10.0.0.0/20" |
 | pod_cidr | CIDR IPv4 range to assign to Kubernetes pods | "10.2.0.0/16" | "10.22.0.0/16" |
 | service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
diff --git a/docs/cl/digital-ocean.md b/docs/cl/digital-ocean.md
index 7fa67323..21b6bc83 100644
--- a/docs/cl/digital-ocean.md
+++ b/docs/cl/digital-ocean.md
@@ -167,11 +167,11 @@ Check the [variables.tf](https://github.com/poseidon/typhoon/blob/master/digital
 
 | Name | Description | Example |
 |:-----|:------------|:--------|
-| cluster_name | Unique cluster name (prepended to dns_zone) | nemo |
-| region | Digital Ocean region | nyc1, sfo2, fra1, tor1 |
-| dns_zone | Digital Ocean domain (i.e. DNS zone) | do.example.com |
+| cluster_name | Unique cluster name (prepended to dns_zone) | "nemo" |
+| region | Digital Ocean region | "nyc1", "sfo2", "fra1", tor1" |
+| dns_zone | Digital Ocean domain (i.e. DNS zone) | "do.example.com" |
 | ssh_fingerprints | SSH public key fingerprints | ["d7:9d..."] |
-| asset_dir | Path to a directory where generated assets should be placed (contains secrets) | /home/user/.secrets/nemo |
+| asset_dir | Absolute path to a directory where generated assets should be placed (contains secrets) | "/home/user/.secrets/nemo" |
 
 #### DNS Zone
 
@@ -214,15 +214,14 @@ Digital Ocean requires the SSH public key be uploaded to your account, so you ma
 |:-----|:------------|:--------|:--------|
 | controller_count | Number of controllers (i.e. masters) | 1 | 1 |
 | worker_count | Number of workers | 1 | 3 |
-| controller_type | Droplet type for controllers | s-2vcpu-2gb | s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb, ... |
-| worker_type | Droplet type for workers | s-1vcpu-2gb | s-1vcpu-2gb, s-2vcpu-2gb, ... |
+| controller_type | Droplet type for controllers | "s-2vcpu-2gb" | s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb, ... |
+| worker_type | Droplet type for workers | "s-1vcpu-2gb" | s-1vcpu-2gb, s-2vcpu-2gb, ... |
 | image | Container Linux image for instances | "coreos-stable" | coreos-stable, coreos-beta, coreos-alpha |
 | controller_clc_snippets | Controller Container Linux Config snippets | [] | [example](/advanced/customization/) |
 | worker_clc_snippets | Worker Container Linux Config snippets | [] | [example](/advanced/customization/) |
-| networking | Choice of networking provider | "flannel" | "flannel" or "calico" (experimental) |
+| networking | Choice of networking provider | "flannel" | "flannel" or "calico" |
 | pod_cidr | CIDR IPv4 range to assign to Kubernetes pods | "10.2.0.0/16" | "10.22.0.0/16" |
 | service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
-| cluster_domain_suffix | FQDN suffix for Kubernetes services answered by coredns. | "cluster.local" | "k8s.example.com" |
 
 Check the list of valid [droplet types](https://developers.digitalocean.com/documentation/changelog/api-v2/new-size-slugs-for-droplet-plan-changes/) or use `doctl compute size list`.