diff --git a/README.md b/README.md
index c387049..5b319e4 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,15 @@
+> [!IMPORTANT]
+> **This repository is archived and no longer maintained.**
+>
+> The implementation uses `math/rand`, which is not suitable for anything
+> security-sensitive, and `Password` has correctness bugs.
+>
+> **Use instead:**
+> - [`crypto/rand`](https://pkg.go.dev/crypto/rand) for tokens, passwords, and anything security-sensitive.
+> - [`github.com/matoous/go-nanoid/v2`](https://github.com/matoous/go-nanoid) or [`github.com/google/uuid`](https://github.com/google/uuid) for identifiers.
+
+---
+
 # Go Random
 
 Functions to create random values. That's about the size of it.