Update README.md

Author: jeremyber-aws

infrastructure/monitoring/README.md

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 This repository contains a CloudFormation template that you can customize to deploy a sample metrics dashboard for your [Managed Service for Apache Flink](https://docs.aws.amazon.com/kinesisanalytics/latest/java/what-is.html) application.
 
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 Here's a screenshot of the dashboard:
 
 ![Dashboard screenshot](img/dashboard.png)
@@ -14,6 +15,9 @@ Before you deploy the template, please make sure that you enter appropriate valu
 - KinesisStreamName (optional): The Kinesis stream name which is configured as input in Kinesis Analytics application (assuming you're reading from a Kinesis stream)
 - DashboardName: The name you'd like to assign to the newly created CloudWatch Dashboard
 
+#### It should be noted that this dashboard supports both Apache Kafka and Amazon Kinesis Data Streams as sources, so long as the application has a single source.
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 ## Security
 
 See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more information.