diff --git a/README.rst b/README.rst
index 76d1633f..b9baa116 100644
--- a/README.rst
+++ b/README.rst
@@ -16,10 +16,15 @@ LICENSE for more details).
 Make it run!
 ============
 
-To make it run, you just have to do use the serve command::
+With a `Python 3 <https://www.python.org/>` environment,
+`pip <https://pypi.python.org/pypi/pip/>` and
+`virtualenv <https://pypi.python.org/pypi/virtualenv>` installed,
+you just have to run the following command::
 
     $ make serve
 
+This will run a Flask app available at `http://localhost:5000`.
+
 It is also better to actually turn the debugging mode on when you're
 developing. You can create a `settings.py` file in the `budget` directory, with
 the following content::