@@ -45,6 +45,7 @@ variable "images" {
 }
 
 variable "zones" {
+  type = "list"
   default = ["us-east-1a", "us-east-1b"]
 }
 ```
Original file line number	Diff line number	Diff line change
`@@ -45,6 +45,7 @@ variable "images" {`
`45`	`45`	`}`
`46`	`46`
`47`	`47`	`variable "zones" {`
	`48`	`+ type = "list"`
`48`	`49`	`default = ["us-east-1a", "us-east-1b"]`
`49`	`50`	`}`
`50`	`51`	```