diff --git a/README.md b/README.md
index bc2f088..a0f1f46 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,9 @@
 
 A proposed [WebAssembly System Interface](https://github.com/WebAssembly/WASI) API.
 
+> [!IMPORTANT]
+> This repository has been merged into the main [WebAssembly/WASI](https://github.com/webassembly/wasi) repository and is now archived.
+
 ### Current Phase
 
 [Phase 3](https://github.com/WebAssembly/WASI/blob/main/Proposals.md#phase-3---implementation-phase-cg--wg)