Listing 3.3: An improved README file for the sample app.

...I suggest updating the README file (located in the root directory of
the application) to be more helpful and descriptive, as shown in Listing
3.3.
Listing 3.3: An improved README file for the sample app.

This is the sample application for
the [*Ruby on Rails Tutorial*](http://railstutorial.org/)
by [Michael Hartl](http://michaelhartl.com/).

Then change it to use the Markdown extension .md and commit the changes:

$ git mv README.rdoc README.md