diff --git a/README.md b/README.md
index d614acf..2305972 100644
--- a/README.md
+++ b/README.md
@@ -6,17 +6,19 @@ A GitHub Action to cleanup AWS resources that have exceeded a TTL.
 
 It supports cleaning up the following services:
 
+- CloudFormation Stacks
 - EKS Clusters
 - Auto Scaling Groups
 
 ## Inputs
 
-| Name              | Required | Description                                                                            |
-| ----------------- | -------- | -------------------------------------------------------------------------------------- |
-| regions           | Y        | A comma seperated list of regions to clean resources in. You can use * for all regions |
-| allow-all-regions | N        | Set to true if use * from regions.                                                     |
-| ttl               | Y        | The duration that a resource can live for. For example, use 24h for 1 day.             |
-| commit            | N        | Whether to perform the delete. Defaults to `false` which is a dry run                  |
+| Name              | Required | Description                                                                                       |
+| ----------------- | -------- | ------------------------------------------------------------------------------------------------- |
+| regions           | Y        | A comma seperated list of regions to clean resources in. You can use * for all regions            |
+| ttl               | Y        | The duration that a resource can live for. For example, use 24h for 1 day.                        |
+| allow-all-regions | N        | Set to true if use * from regions.                                                                |
+| commit            | N        | Whether to perform the delete. Defaults to `false` which is a dry run                             |
+| ignore-tag        | N        | The name of the tag that indicates a resource should not be deleted. Defaults to `janitor-ignore` |
 
 ## Example Usage