diff --git a/README.rst b/README.rst
index a7fe46e7..e4a5ec0a 100644
--- a/README.rst
+++ b/README.rst
@@ -52,6 +52,11 @@ This enables ``session.install`` to install packages at the versions specified i
         session.run("pytest")
 
 
+.. warning::
+
+   This project is not affiliated with Nox, and not an official Nox plugin.
+
+
 Installation
 ------------