diff --git a/99-variables.tf b/99-variables.tf
index c2cb911..81c730d 100644
--- a/99-variables.tf
+++ b/99-variables.tf
@@ -33,3 +33,8 @@ variable "flavor" {
   default     = "m1.2"
 }
 
+variable "public_key_file" {
+  type = string
+  default = "/root/.ssh/id_ed25519.pub"
+}
+