diff --git a/tofu/kubernetes/variables.tofu b/tofu/kubernetes/variables.tofu
index b2035b0..48ad3c7 100644
--- a/tofu/kubernetes/variables.tofu
+++ b/tofu/kubernetes/variables.tofu
@@ -35,6 +35,7 @@ variable "talos_cluster_config" {
     name                         = string
     vip                          = optional(string)
     gateway                      = string
+    subnet_mask                  = optional(string, "24")
     talos_machine_config_version = optional(string)
     proxmox_cluster              = string
     kubernetes_version           = string