diff --git a/src/outputs.tf b/src/outputs.tf
index 0bd4d04..c702e9d 100644
--- a/src/outputs.tf
+++ b/src/outputs.tf
@@ -2,3 +2,8 @@ output "redis_clusters" {
   description = "Redis cluster objects"
   value       = local.enabled ? local.clusters : {}
 }
+
+output "security_group_id" {
+  description = "The security group ID of the ElastiCache Redis cluster"
+  value       = local.enabled ? try(module.redis_clusters[keys(var.redis_clusters)[0]].security_group_id, null) : null
+}