Update README.rst

README.rst

@@ -43,6 +43,7 @@ Requirements
 * ``Python>3.6``
 * PostgreSQL (MySQL is experimental, other databases probably not working but PRs are welcome)
 * ``simplejson`` for charts based on ``DecimalField`` values
+* The current PyPI version of `django-cache-utils` `is not compatible with Django 4.0 <https://github.com/PetrDlouhy/django-admin-charts/issues/39>`_. To install compatible version you can install working version by running ``pip install git+https://github.com/PetrDlouhy/django-cache-utils@django40``.
 
 ============
 Installation