diff --git a/README.md b/README.md
index 4700196..0acdc56 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ terraform plan
 | custom\_user\_data | A list of strings representing commands to add to the Launch Configuration user data to execute during instance initialization. Each string (or each command) must end with `\n`. Example: `["touch some/file\n", "wget ...\n"]` | `list(string)` | `[]` | no |
 | redirect\_http\_to\_https | If true, requests to the AccessTier on port 80 will be redirected to port 443 | `bool` | `false` | no |
 | iam\_instance\_profile | The name attribute of the IAM instance profile to associate with launched instances. | `string` | `null` | no |
+| tags | Additional tags to apply to resources created by this module | `map` | `null` | no |
 
 ## Outputs