diff --git a/README.md b/README.md
index a9d117eddc..0775416dce 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
+> [!WARNING]
+> We announced the deprecation of Atlas Device Sync + Realm SDKs in September 2024. For more information please see:
+> - [SDK Deprecation](https://www.mongodb.com/docs/atlas/device-sdks/device-sdk-deprecation)
+> - [Device Sync Deprecation](https://www.mongodb.com/docs/atlas/app-services/sync/device-sync-deprecation)
+>
+> For a version of `realm-swift` without sync features, install version 20 or see the `community` branch.
+
 <picture>
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     <img src="./media/logo.svg" alt="realm by MongoDB">