diff --git a/exposition.tf b/exposition.tf
index 2e289af..a7e7bb6 100644
--- a/exposition.tf
+++ b/exposition.tf
@@ -61,10 +61,10 @@ resource "kubernetes_manifest" "certificate" {
     }
     spec = {
       secretName = local.certificate_secret_name
-      dnsNames = [
+      dnsNames = concat([
         local.service_hostname,
         format("*.%s", local.service_hostname)
-      ]
+      ], var.additional_ingress_host)
       issuerRef = {
         kind  = "ClusterIssuer"
         name  = "localdomain-issuer"