diff --git a/website/docs/r/aws_auth_backend_sts_role.html.md b/website/docs/r/aws_auth_backend_sts_role.html.md
index 20535a616..76d4ed6ee 100644
--- a/website/docs/r/aws_auth_backend_sts_role.html.md
+++ b/website/docs/r/aws_auth_backend_sts_role.html.md
@@ -51,6 +51,8 @@ The following arguments are supported:
 * `backend` - (Optional) The path the AWS auth backend being configured was
    mounted at.  Defaults to `aws`.
 
+* `external_id` - (Optional) External ID expected by the STS role. The associated STS role must be configured to require the external ID.
+
 ## Attributes Reference
 
 No additional attributes are exported by this resource.