# Adding a source identifier to an Amazon RDS event notification subscription
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You can add a source identifier (the Amazon RDS source generating the event) to an existing subscription.

## Console
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You can easily add or remove source identifiers using the Amazon RDS console by selecting or deselecting them when modifying a subscription. For more information, see [Modifying an Amazon RDS event notification subscription](USER_Events.Modifying.md).

## AWS CLI
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To add a source identifier to an Amazon RDS event notification subscription, use the AWS CLI [https://docs.aws.amazon.com/](https://docs.aws.amazon.com/) command. Include the following required parameters:
+ `--subscription-name`
+ `--source-identifier`

**Example**  
The following example adds the source identifier `mysqldb` to the `myrdseventsubscription` subscription.  
For Linux, macOS, or Unix:  

```
aws rds add-source-identifier-to-subscription \
    --subscription-name myrdseventsubscription \
    --source-identifier mysqldb
```
For Windows:  

```
aws rds add-source-identifier-to-subscription ^
    --subscription-name myrdseventsubscription ^
    --source-identifier mysqldb
```

## API
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To add a source identifier to an Amazon RDS event notification subscription, call the Amazon RDS API [https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_AddSourceIdentifierToSubscription.html](https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_AddSourceIdentifierToSubscription.html). Include the following required parameters:
+ `SubscriptionName`
+ `SourceIdentifier`