public EmailContent withAdditionalMessage(String additionalMessage) {
        setAdditionalMessage(additionalMessage);
        return this;
    }
<p>
The message that you want to send. The message can be up to 200 characters.
</p>

@param additionalMessage
       The message that you want to send. The message can be up to 200 characters.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-iotevents/src/main/java/com/amazonaws/services/iotevents/model/EmailContent.java