diff --git a/INSTALL.rst b/INSTALL.rst
index b16bcea49..1edc67fe3 100644
--- a/INSTALL.rst
+++ b/INSTALL.rst
@@ -19,7 +19,12 @@ Lutris uses Python's distutils framework for installation. In order to
 install Lutris, you will need root access. To install Lutris, perform
 the following command as root::
 
-      $ python setup.py install
+      $ python3 setup.py install
+
+**Warning:** USING SETUP.PY TO INSTALL LUTRIS IS ENTIRELY UNSUPPORTED BY
+THE DEVELOPERS. USE THAT METHOD AT YOUR OWN RISK. THE RECOMMENDED WAY OF
+INSTALLING LUTRIS IS WITH PROVIDED DISTRIBUTION PACKAGES. IF YOU WANT TO 
+USE THE DEVELOPMENT VERSION, JUST RUN IT FROM THE SOURCE DIR ITSELF.
 
 **Warning:** there is no way to cleanly uninstall programs installed with
 setup.py other than manuall deleting the created files. Prefer installing