diff --git a/infrastructure/environments/prod/variables.sh b/infrastructure/environments/prod/variables.sh
index 1dc2da7..6bc7e58 100644
--- a/infrastructure/environments/prod/variables.sh
+++ b/infrastructure/environments/prod/variables.sh
@@ -2,9 +2,10 @@ ENV_CONFIG=prod
 ENVIRONMENT=prod
 AZURE_SUBSCRIPTION="Breast Screening - Manage Breast Screening - Prod"
 HUB_SUBSCRIPTION="Digital Screening DToS - Core Services Prod Hub"
-HUB=prod
 TERRAFORM_MODULES_REF=main
+HUB=prod
 ENABLE_SOFT_DELETE=true
 ADO_MANAGEMENT_POOL=private-pool-prod-uks
 CLOUD_API_HOSTNAME=manage-breast-screening.nhs.uk
-# To onboard more rings: set GATEWAY_RINGS="ring0 ring1 ring2 ..." in this file
+# ring1 = first real sites (one per PACS vendor)
+GATEWAY_RINGS="ring1"