How to add a command hook into setuptools setup?

I am using setuptools Version 0.9.6 and want to add a command hook into `setup`, following the description shown here or here. I have created a class `MyCommand` derived from `setuptools.Command` within the same `setup.py` file and I am trying to add this hook as follows: ``` setup( # ... entry_points = { "distutils.commands": [ "my_command = MyCommand"]} ) ``` However, the command `my_command` is not recognized, i.e. `python setup.py my_command` gives an error ``` error: invalid command 'my_command' ``` Maybe I do need to refer to my command in a different way? Or are there changes to the used version 0.9.6 of `setuptools`? How to do it right?