diff --git a/docs/deployment-on-heroku.rst b/docs/deployment-on-heroku.rst
index fdd953e0..f5808449 100644
--- a/docs/deployment-on-heroku.rst
+++ b/docs/deployment-on-heroku.rst
@@ -12,7 +12,8 @@ Run these commands to deploy the project to Heroku:
 
     heroku create --buildpack heroku/python
 
-    heroku addons:create heroku-postgresql:mini
+    # Note: this is not a free plan
+    heroku addons:create heroku-postgresql:essential-0
     # On Windows use double quotes for the time zone, e.g.
     # heroku pg:backups schedule --at "02:00 America/Los_Angeles" DATABASE_URL
     heroku pg:backups schedule --at '02:00 America/Los_Angeles' DATABASE_URL