# IAM JSON policy elements: Sid
Sid

You can provide a `Sid` (statement ID) as an optional identifier for the policy statement. You can assign a `Sid` value to each statement in a statement array. You can use the `Sid` value as a description for the policy statement. In services that let you specify an `ID` element, such as SQS and SNS, the `Sid` value is just a sub-ID of the policy document ID. In IAM, the `Sid` value must be unique within a JSON policy.

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#### [ JSON ]

****  

```
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Sid": "ExampleStatementID",
      "Effect": "Allow",
      "Action": "s3:ListAllMyBuckets",
      "Resource": "*"
    }
  ]
}
```

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The `Sid` element supports ASCII uppercase letters (A-Z), lowercase letters (a-z), and numbers (0-9). 

IAM does not expose the `Sid` in the IAM API. You can't retrieve a particular statement based on this ID.

**Note**  
Some AWS services (for example, Amazon SQS or Amazon SNS) might require this element and have uniqueness requirements for it. For service-specific information about writing policies, refer to the documentation for the service you work with.