diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# OpenNest Engines
+# OpenNest Engines (archived)
+
+> **Archived.** The production engines now live in the main
+> [OpenNest](https://git.thecozycat.net/aj/OpenNest) repository as built-in engines named for
+> the jobs they suit: `Rectangles` (was `OpenNest.Engine.Rectangles`) and `Irregular` (was
+> `OpenNest.Engine.Opus55`), in `OpenNest.Engine/NestingEngines/`. See `docs/nesting-engines.md`
+> there. This repository is kept read-only for reference; Gpt6Astra and Qwen38FlashNext are not
+> carried forward.
 
 Independent nesting engine plugins for [OpenNest](https://git.thecozycat.net/aj/OpenNest).
 Each engine is a standalone class library that OpenNest discovers at runtime via