diff --git a/README.md b/README.md
index 4fcd570..5ccc080 100644
--- a/README.md
+++ b/README.md
@@ -100,12 +100,6 @@ Description: ARN of the certificate to be used for the Vault endpoint ELB
 
 Type: `string`
 
-### <a name="input_ami_id"></a> [ami\_id](#input\_ami\_id)
-
-Description: ID of the AMI to be used for the Consul and Vault instances.
-
-Type: `string`
-
 ## Optional Inputs
 
 The following input variables are optional (have default values):
@@ -236,6 +230,14 @@ Type: `string`
 
 Default: `""`
 
+### <a name="input_ami_id"></a> [ami\_id](#input\_ami\_id)
+
+Description: ID of the AMI to be used for the Consul and Vault instances.
+
+Type: `string`
+
+Default: `null`
+
 <!-- TFDOCS_INPUTS_END -->
 
 <!-- TFDOCS_OUTPUTS_START -->