# Document revisions
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| Change | Description | Date | 
| --- |--- |--- |
| [New lens version](#document-revisions) | Updated all best practices across the entire lens with new structure and guidance. Updated formatting to be consistent with other Well-Architected lenses. | November 19, 2025 | 
| [Major update](#document-revisions) | Whitepaper updated to reflect current best practices, implementation guidance, and AWS services.<br /> Added the sustainability pillar that describes reducing your impact on the environment while taking advantage of AWS advanced AI/ML capabilities for your business. <br /> Updated technical references and resources including product documentation, blog posts, instructional and video links, and solution briefs.  | July 5, 2023 | 
| [Minor update](#document-revisions) | Fixed broken links. | April 6, 2023 | 
| [Minor update](#document-revisions) | Corrected typo. | July 21, 2022 | 
| [Major update](#document-revisions) | Whitepaper updated to reflect current best practices and AWS services. | October 12, 2021 | 
| [Minor changes](#document-revisions) | Updated links in the whitepaper. | January 21, 2021 | 
| [Initial publication](#document-revisions) | Machine Learning Lens first published. | April 16, 2020 | 

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