This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::SMSVOICE::Pool MandatoryKeyword
<a name="aws-properties-smsvoice-pool-mandatorykeyword"></a>

The keywords `HELP` and `STOP` are mandatory keywords that each phone number must have. For more information, see [Keywords](https://docs.amazonaws.cn/sms-voice/latest/userguide/keywords.html) in the Amazon End User Messaging SMS User Guide.

## Syntax
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To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-smsvoice-pool-mandatorykeyword-syntax.json"></a>

```
{
  "[Message](#cfn-smsvoice-pool-mandatorykeyword-message)" : {{String}}
}
```

### YAML
<a name="aws-properties-smsvoice-pool-mandatorykeyword-syntax.yaml"></a>

```
  [Message](#cfn-smsvoice-pool-mandatorykeyword-message): {{String}}
```

## Properties
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`Message`  <a name="cfn-smsvoice-pool-mandatorykeyword-message"></a>
The message associated with the keyword.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^(?!\s*$)[\s\S]+$`  
*Maximum*: `1600`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)