diff --git a/README.md b/README.md
index f7c6758..71efead 100644
--- a/README.md
+++ b/README.md
@@ -151,7 +151,7 @@ You need the following permissions to run this module.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_access_tags"></a> [access\_tags](#input\_access\_tags) | A list of access tags to apply to the IBM Cloud Logs instance created by the module. For more information, see https://cloud.ibm.com/docs/account?topic=account-access-tags-tutorial. | `list(string)` | `[]` | no |
-| <a name="input_cbr_rules"></a> [cbr\_rules](#input\_cbr\_rules) | (Optional, list) List of context-based restrictions rules to create | <pre>list(object({<br/>    description = string<br/>    account_id  = string<br/>    rule_contexts = list(object({<br/>      attributes = optional(list(object({<br/>        name  = string<br/>        value = string<br/>    }))) }))<br/>    enforcement_mode = string<br/>    operations = optional(list(object({<br/>      api_types = list(object({<br/>        api_type_id = string<br/>      }))<br/>    })))<br/>  }))</pre> | `[]` | no |
+| <a name="input_cbr_rules"></a> [cbr\_rules](#input\_cbr\_rules) | The context-based restrictions rule to create. Only one rule is allowed. | <pre>list(object({<br/>    description = string<br/>    account_id  = string<br/>    rule_contexts = list(object({<br/>      attributes = optional(list(object({<br/>        name  = string<br/>        value = string<br/>    }))) }))<br/>    enforcement_mode = string<br/>    operations = optional(list(object({<br/>      api_types = list(object({<br/>        api_type_id = string<br/>      }))<br/>    })))<br/>  }))</pre> | `[]` | no |
 | <a name="input_data_storage"></a> [data\_storage](#input\_data\_storage) | A logs data bucket and a metrics bucket in IBM Cloud Object Storage to store your IBM Cloud Logs data for long term storage, search, analysis and alerting. | <pre>object({<br/>    logs_data = optional(object({<br/>      enabled              = optional(bool, false)<br/>      bucket_crn           = optional(string)<br/>      bucket_endpoint      = optional(string)<br/>      skip_cos_auth_policy = optional(bool, false)<br/>    }), {})<br/>    metrics_data = optional(object({<br/>      enabled              = optional(bool, false)<br/>      bucket_crn           = optional(string)<br/>      bucket_endpoint      = optional(string)<br/>      skip_cos_auth_policy = optional(bool, false)<br/>    }), {})<br/>    }<br/>  )</pre> | <pre>{<br/>  "logs_data": null,<br/>  "metrics_data": null<br/>}</pre> | no |
 | <a name="input_existing_event_notifications_instances"></a> [existing\_event\_notifications\_instances](#input\_existing\_event\_notifications\_instances) | List of Event Notifications instance details for routing critical events that occur in your IBM Cloud Logs. | <pre>list(object({<br/>    crn                  = string<br/>    integration_name     = optional(string)<br/>    skip_iam_auth_policy = optional(bool, false)<br/>  }))</pre> | `[]` | no |
 | <a name="input_instance_name"></a> [instance\_name](#input\_instance\_name) | The name of the IBM Cloud Logs instance to create. Defaults to 'cloud-logs-<region>' | `string` | `null` | no |
diff --git a/variables.tf b/variables.tf
index 926e6ff..712518f 100644
--- a/variables.tf
+++ b/variables.tf
@@ -200,7 +200,11 @@ variable "cbr_rules" {
       }))
     })))
   }))
-  description = "(Optional, list) List of context-based restrictions rules to create"
+  description = "The context-based restrictions rule to create. Only one rule is allowed."
   default     = []
   # Validation happens in the rule module
+  validation {
+    condition     = length(var.cbr_rules) <= 1
+    error_message = "Only one CBR rule is allowed."
+  }
 }