diff --git a/README.md b/README.md
index ee0b31f5..b02ecf9e 100644
--- a/README.md
+++ b/README.md
@@ -428,6 +428,7 @@ Available targets:
 | <a name="input_cluster_type"></a> [cluster\_type](#input\_cluster\_type) | Either `regional` or `global`.<br>If `regional` will be created as a normal, standalone DB.<br>If `global`, will be made part of a Global cluster (requires `global_cluster_identifier`). | `string` | `"regional"` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "descriptor_formats": {},<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "labels_as_tags": [<br>    "unset"<br>  ],<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {},<br>  "tenant": null<br>}</pre> | no |
 | <a name="input_copy_tags_to_snapshot"></a> [copy\_tags\_to\_snapshot](#input\_copy\_tags\_to\_snapshot) | Copy tags to backup snapshots | `bool` | `false` | no |
+| <a name="input_db_cluster_instance_class"></a> [db\_cluster\_instance\_class](#input\_db\_cluster\_instance\_class) | This setting is required to create a provisioned Multi-AZ DB cluster | `string` | `null` | no |
 | <a name="input_db_name"></a> [db\_name](#input\_db\_name) | Database name (default is not to create a database) | `string` | `""` | no |
 | <a name="input_db_port"></a> [db\_port](#input\_db\_port) | Database port | `number` | `3306` | no |
 | <a name="input_deletion_protection"></a> [deletion\_protection](#input\_deletion\_protection) | If the DB instance should have deletion protection enabled | `bool` | `false` | no |
diff --git a/docs/terraform.md b/docs/terraform.md
index 4b9eae6a..62546273 100644
--- a/docs/terraform.md
+++ b/docs/terraform.md
@@ -76,6 +76,7 @@
 | <a name="input_cluster_type"></a> [cluster\_type](#input\_cluster\_type) | Either `regional` or `global`.<br>If `regional` will be created as a normal, standalone DB.<br>If `global`, will be made part of a Global cluster (requires `global_cluster_identifier`). | `string` | `"regional"` | no |
 | <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "descriptor_formats": {},<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "labels_as_tags": [<br>    "unset"<br>  ],<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {},<br>  "tenant": null<br>}</pre> | no |
 | <a name="input_copy_tags_to_snapshot"></a> [copy\_tags\_to\_snapshot](#input\_copy\_tags\_to\_snapshot) | Copy tags to backup snapshots | `bool` | `false` | no |
+| <a name="input_db_cluster_instance_class"></a> [db\_cluster\_instance\_class](#input\_db\_cluster\_instance\_class) | This setting is required to create a provisioned Multi-AZ DB cluster | `string` | `null` | no |
 | <a name="input_db_name"></a> [db\_name](#input\_db\_name) | Database name (default is not to create a database) | `string` | `""` | no |
 | <a name="input_db_port"></a> [db\_port](#input\_db\_port) | Database port | `number` | `3306` | no |
 | <a name="input_deletion_protection"></a> [deletion\_protection](#input\_deletion\_protection) | If the DB instance should have deletion protection enabled | `bool` | `false` | no |
diff --git a/main.tf b/main.tf
index bcb8d267..647aa4fd 100644
--- a/main.tf
+++ b/main.tf
@@ -80,6 +80,7 @@ resource "aws_rds_cluster" "primary" {
   final_snapshot_identifier           = var.cluster_identifier == "" ? lower(module.this.id) : lower(var.cluster_identifier)
   skip_final_snapshot                 = var.skip_final_snapshot
   apply_immediately                   = var.apply_immediately
+  db_cluster_instance_class           = local.is_serverless ? null : var.db_cluster_instance_class
   storage_encrypted                   = local.is_serverless ? null : var.storage_encrypted
   storage_type                        = var.storage_type
   iops                                = var.iops
diff --git a/variables.tf b/variables.tf
index 0873310d..08ac96cb 100644
--- a/variables.tf
+++ b/variables.tf
@@ -110,6 +110,12 @@ variable "instance_parameters" {
   description = "List of DB instance parameters to apply"
 }
 
+variable "db_cluster_instance_class" {
+  type        = string
+  default     = null
+  description = "This setting is required to create a provisioned Multi-AZ DB cluster"
+}
+
 variable "cluster_family" {
   type        = string
   default     = "aurora5.6"