diff --git a/README.rst b/README.rst
index 4a4c8ab65dceff..87f676c43a988a 100644
--- a/README.rst
+++ b/README.rst
@@ -1,6 +1,8 @@
 This is Python version 3.13.0 alpha 0
 =====================================
 
+DO NOT USE (for testing only)
+
 .. image:: https://github.com/python/cpython/workflows/Tests/badge.svg
    :alt: CPython build status on GitHub Actions
    :target: https://github.com/python/cpython/actions