# Document history
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The following table describes important additions to the AWS Nitro Enclaves documentation. We also update the documentation frequently to address the feedback that you send us.

| Change | Description | Date | 
| --- |--- |--- |
| [Multiple enclaves per instance](https://docs.aws.amazon.com/enclaves/latest/user/multiple-enclaves.html) | You can run up to four Nitro Enclaves on a single parent Amazon EC2 instance. | January 13, 2023 | 
| [Amazon EKS support](https://docs.aws.amazon.com/enclaves/latest/user/kubernetes.html) | You can use Amazon Elastic Kubernetes Service to orchestrate, scale, and deploy Nitro Enclaves from a Kubernetes pod. | November 28, 2022 | 
| [AWS Graviton support](https://docs.aws.amazon.com/enclaves/latest/user/nitro-enclave.html#nitro-enclave-reqs) | Nitro Enclaves now supports AWS Graviton-based Amazon EC2 instance types, except A1, G5g, Im4gn, Is4gen, and T4g. | October 20, 2022 | 
| [ACM for Nitro Enclaves](https://docs.aws.amazon.com/enclaves/latest/user/nitro-enclave-refapp.html) | ACM for Nitro Enclaves now supports Apache HTTP server. | September 14, 2022 | 
| [Nitro Enclaves 1.2.0 for Windows](https://docs.aws.amazon.com/enclaves/latest/user/developing-applications-windows.html#release-notes) | Nitro Enclaves 1.2.0 is now available for Windows. | May 4, 2022 | 
| [Amazon SNS topic for Nitro Enclaves for Windows updates](https://docs.aws.amazon.com/enclaves/latest/user/developing-applications-windows.html#sns-topic) | You can subscribe to an Amazon SNS topic to receive notifications for new versions of Nitro Enclaves for Windows. | August 13, 2021 | 
| [Nitro Enclaves 1.1.0 for Windows](https://docs.aws.amazon.com/enclaves/latest/user/developing-applications-windows.html#release-notes) | Nitro Enclaves 1.1.0 is now available for Windows. | July 28, 2021 | 
| [Nitro Enclaves on Windows](https://docs.aws.amazon.com/enclaves/latest/user/developing-applications-windows.html) | Nitro Enclaves supports the creation of isolated compute environments form parent Amazon EC2 instances running Windows operating system. | April 27, 2021 | 
| [Initial release](https://docs.aws.amazon.com/enclaves/latest/user/nitro-enclave.html) | Initial release of AWS Nitro Enclaves. Nitro Enclaves is an Amazon EC2 feature that allows you to create isolated execution environments, called enclaves, from Amazon EC2 instances. | October 28, 2020 |