diff --git a/README.md b/README.md
index bdeab0f..9250f7c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 [![Build Status](https://github.com/jupyter-server/pycrdt/actions/workflows/test.yml/badge.svg?query=branch%3Amain++)](https://github.com/jupyter-server/pycrdt/actions/workflows/test.yml/badge.svg?query=branch%3Amain++)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
+:warning: This project is in still in an **incubating** phase (i.e. it's not ready for production yet) :warning:
+
 # pycrdt
 
 CRDTs based on [Yrs](https://github.com/y-crdt/y-crdt/tree/main/yrs).