diff --git a/README.md b/README.md
index e7ca711..0475bc7 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,11 @@ module "aws_iam_role" {
 }
 ```
 
+## Assume role policy
+
+This role is designed to be used with AWS Identity Center and provisions a trust
+relationship to the root organization account.
+
 ## Policies
 
 The IAM role is granted the following permissions on the AWS account: