diff --git a/README.md b/README.md
index 26e47f3..afc1a9e 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# go-mplex
+# DEPRECATED: go-mplex
+
+mplex is deprecated. When on TCP, we recommend using [Yamux](https://github.com/libp2p/go-yamux/) instead.
+If TCP is not a requirement, consider using QUIC instead.
+
+Ref: Discussion around mplex deprecation: https://github.com/libp2p/specs/issues/553
+
+---
 
 [![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
 [![Go Reference](https://pkg.go.dev/badge/github.com/libp2p/go-mplex.svg)](https://pkg.go.dev/github.com/libp2p/go-mplex)