diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,16 @@
# Machine Learning Model Extension Specification
+> :warning:
+> This repository is deprecated in favor of the new official community location
+> [stac-extensions/mlm](https://github.com/stac-extensions/mlm).
+> The corresponding schemas are made available on
+> [https://stac-extensions.github.io/mlm/](https://stac-extensions.github.io/mlm/).
+>
+> This repository remains availabe as archive for STAC definitions that could still refer to
+> [https://crim-ca.github.io/mlm-extension/](https://crim-ca.github.io/mlm-extension/) schemas.
+> If you intend to employ STAC MLM for future work, it is **STRONGLY** recommended that you migrate to the
+> [stac-extensions/mlm](https://github.com/stac-extensions/mlm) schemas.
+
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- **Title:** Machine Learning Model Extension