diff --git a/README.md b/README.md
index ffcd8ac..4714e51 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+> [!WARNING]
+> This crate has been archived. Development has moved to the [zksync-crypto](https://github.com/matter-labs/zksync-crypto) repository.
+> Please use it instead.
+
 # Boojum
 
 [![Logo](eraLogo.png)](https://zksync.io/)