diff --git a/README.md b/README.md
index f136b21..46ea423 100644
--- a/README.md
+++ b/README.md
@@ -120,28 +120,43 @@ Available targets:
   lint                                Lint terraform code
 
 ```
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | ~> 0.12.0 |
+| github | ~> 2.8.0 |
+| github | ~> 2.2 |
+| local | ~> 1.2 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| github | ~> 2.8.0 ~> 2.2 |
+
 ## Inputs
 
 | Name | Description | Type | Default | Required |
-|------|-------------|:----:|:-----:|:-----:|
-| active | Indicate of the webhook should receive events | bool | `true` | no |
-| enabled | Whether or not to enable this module | bool | `true` | no |
-| events | A list of events which should trigger the webhook. | list(string) | `<list>` | no |
-| github_anonymous | Github Anonymous API (if `true`, token must not be set as GITHUB_TOKEN or `github_token`) | bool | `false` | no |
-| github_base_url | GitHub target API endpoint | string | `https://api.github.com/` | no |
-| github_organization | GitHub organization to use when creating webhooks | string | - | yes |
-| github_repositories | List of repository names which should be associated with the webhook | list(string) | `<list>` | no |
-| github_token | GitHub token used for API access. If not provided, can be sourced from the `GITHUB_TOKEN` environment variable | string | `` | no |
-| webhook_content_type | Webhook Content Type (e.g. `json`) | string | `json` | no |
-| webhook_insecure_ssl | Webhook Insecure SSL (e.g. trust self-signed certificates) | bool | `false` | no |
-| webhook_secret | Webhook secret | string | `` | no |
-| webhook_url | Webhook URL | string | - | yes |
+|------|-------------|------|---------|:--------:|
+| active | Indicate of the webhook should receive events | `bool` | `true` | no |
+| enabled | Whether or not to enable this module | `bool` | `true` | no |
+| events | A list of events which should trigger the webhook. | `list(string)` | <pre>[<br>  "issue_comment",<br>  "pull_request",<br>  "pull_request_review",<br>  "pull_request_review_comment"<br>]</pre> | no |
+| github\_anonymous | Github Anonymous API (if `true`, token must not be set as GITHUB\_TOKEN or `github_token`) | `bool` | `false` | no |
+| github\_base\_url | GitHub target API endpoint | `string` | `"https://api.github.com/"` | no |
+| github\_organization | GitHub organization to use when creating webhooks | `string` | n/a | yes |
+| github\_repositories | List of repository names which should be associated with the webhook | `list(string)` | `[]` | no |
+| github\_token | GitHub token used for API access. If not provided, can be sourced from the `GITHUB_TOKEN` environment variable | `string` | `""` | no |
+| webhook\_content\_type | Webhook Content Type (e.g. `json`) | `string` | `"json"` | no |
+| webhook\_insecure\_ssl | Webhook Insecure SSL (e.g. trust self-signed certificates) | `bool` | `false` | no |
+| webhook\_secret | Webhook secret | `string` | `""` | no |
+| webhook\_url | Webhook URL | `string` | n/a | yes |
 
 ## Outputs
 
 | Name | Description |
 |------|-------------|
-| webhook_url | Webhook URL |
+| webhook\_url | Webhook URL |
 
 
 
diff --git a/docs/terraform.md b/docs/terraform.md
index cd2e869..1565992 100644
--- a/docs/terraform.md
+++ b/docs/terraform.md
@@ -1,23 +1,38 @@
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | ~> 0.12.0 |
+| github | ~> 2.8.0 |
+| github | ~> 2.2 |
+| local | ~> 1.2 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| github | ~> 2.8.0 ~> 2.2 |
+
 ## Inputs
 
 | Name | Description | Type | Default | Required |
-|------|-------------|:----:|:-----:|:-----:|
-| active | Indicate of the webhook should receive events | bool | `true` | no |
-| enabled | Whether or not to enable this module | bool | `true` | no |
-| events | A list of events which should trigger the webhook. | list(string) | `<list>` | no |
-| github_anonymous | Github Anonymous API (if `true`, token must not be set as GITHUB_TOKEN or `github_token`) | bool | `false` | no |
-| github_base_url | GitHub target API endpoint | string | `https://api.github.com/` | no |
-| github_organization | GitHub organization to use when creating webhooks | string | - | yes |
-| github_repositories | List of repository names which should be associated with the webhook | list(string) | `<list>` | no |
-| github_token | GitHub token used for API access. If not provided, can be sourced from the `GITHUB_TOKEN` environment variable | string | `` | no |
-| webhook_content_type | Webhook Content Type (e.g. `json`) | string | `json` | no |
-| webhook_insecure_ssl | Webhook Insecure SSL (e.g. trust self-signed certificates) | bool | `false` | no |
-| webhook_secret | Webhook secret | string | `` | no |
-| webhook_url | Webhook URL | string | - | yes |
+|------|-------------|------|---------|:--------:|
+| active | Indicate of the webhook should receive events | `bool` | `true` | no |
+| enabled | Whether or not to enable this module | `bool` | `true` | no |
+| events | A list of events which should trigger the webhook. | `list(string)` | <pre>[<br>  "issue_comment",<br>  "pull_request",<br>  "pull_request_review",<br>  "pull_request_review_comment"<br>]</pre> | no |
+| github\_anonymous | Github Anonymous API (if `true`, token must not be set as GITHUB\_TOKEN or `github_token`) | `bool` | `false` | no |
+| github\_base\_url | GitHub target API endpoint | `string` | `"https://api.github.com/"` | no |
+| github\_organization | GitHub organization to use when creating webhooks | `string` | n/a | yes |
+| github\_repositories | List of repository names which should be associated with the webhook | `list(string)` | `[]` | no |
+| github\_token | GitHub token used for API access. If not provided, can be sourced from the `GITHUB_TOKEN` environment variable | `string` | `""` | no |
+| webhook\_content\_type | Webhook Content Type (e.g. `json`) | `string` | `"json"` | no |
+| webhook\_insecure\_ssl | Webhook Insecure SSL (e.g. trust self-signed certificates) | `bool` | `false` | no |
+| webhook\_secret | Webhook secret | `string` | `""` | no |
+| webhook\_url | Webhook URL | `string` | n/a | yes |
 
 ## Outputs
 
 | Name | Description |
 |------|-------------|
-| webhook_url | Webhook URL |
+| webhook\_url | Webhook URL |
 
diff --git a/main.tf b/main.tf
index 4e1061d..0410ac4 100644
--- a/main.tf
+++ b/main.tf
@@ -1,3 +1,9 @@
+terraform {
+  required_providers {
+    github = "~> 2.8.0"
+  }
+}
+
 provider "github" {
   token        = var.github_token != "" ? var.github_token : null
   organization = var.github_organization