diff --git a/modules/guardrails/variables.tf b/modules/guardrails/variables.tf
index 3828384f..a3789f9f 100644
--- a/modules/guardrails/variables.tf
+++ b/modules/guardrails/variables.tf
@@ -79,4 +79,10 @@ variable "additional_user_defined_string" {
    variable "terraform_sa_project" {
   description = "GCP Project where the Terraform Service Account(s) exist"
   type        = string
-}
\ No newline at end of file
+}
+
+variable "services" {
+  description = "Service APIs to enable."
+  type        = list(string)
+  default     = []
+}