diff --git a/examples/organization/README.md b/examples/organization/README.md
index 832c16f5..a1054752 100644
--- a/examples/organization/README.md
+++ b/examples/organization/README.md
@@ -7,7 +7,7 @@ When it sets to `master`, this module configure the account to be ready to gathe
 
 ## Master Account
 
-In the master account configuration, you need to set `account_type` to `master` and specify member account information in `member accounts`.
+In the master account configuration, you need to set `account_type` to `master` and specify member account information in `member_accounts`.
 
 The following shows a sample usage.
 
diff --git a/examples/organization/master/variables.tf b/examples/organization/master/variables.tf
index ab25712a..91abcd10 100644
--- a/examples/organization/master/variables.tf
+++ b/examples/organization/master/variables.tf
@@ -3,17 +3,17 @@ variable "audit_s3_bucket_name" {
   type        = string
 }
 
-variable "region" {
-  description = "The AWS region in which global resources are set up."
-  type        = string
-  default     = "us-east-1"
-}
-
 variable "member_accounts" {
   description = "A list of AWS account IDs."
   type = list(object({
     account_id = string
     email      = string
   }))
-  default = []
 }
+
+variable "region" {
+  description = "The AWS region in which global resources are set up."
+  type        = string
+  default     = "us-east-1"
+}
+