diff --git a/README.md b/README.md
index f1738e96..aa5a1ba1 100644
--- a/README.md
+++ b/README.md
@@ -361,10 +361,10 @@ Some iidy features can be configured globally via [SSM Parameter
 Store](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-parameter-store.html)
 configurations.
 
-| Parameter | Description |
-|-----------|-------------|
-| `/iidy/default-notification-arn` | Provides a value for `NotificationARNs` if it is not set |
-| `/iidy/disable-template-approval` | Unsets `ApprovedTemplateLocation` to disable the template approval process |
+| Parameter | Value |Description |
+|-----------|-------|------------|
+| `/iidy/default-notification-arn` | An ARN, eg. `"arn:aws:sns:us-east-1:0123456789:mytopic"` | Provides a value for `NotificationARNs` if it is not set |
+| `/iidy/disable-template-approval` | Must be the string `"true"` | Unsets `ApprovedTemplateLocation` to disable the template approval process |
 
 **Note** that SSM Parameter Store values are isolated to the AWS Account and Region they are set in.