cannot install globally with composer

[bruno-ds]

Hello,
using Composer version 1.5.6,
when I execute : composer global require sensiolabs-de/deprecation-detector,
I receive this error message :

[InvalidArgumentException]
Could not find a matching version of package sensiolabs-de/deprecation-detector. Check the package spelling, your version constraint and that the package is available in a stability which matches your minimum-stability (stable).

[xabbuh]

There is no stable release yet. You would need to install the package like this: composer global require sensiolabs-de/deprecation-detector:^0.1@alpha

[bruno-ds]

Thank you,
perhaps, the readme.md could include this information here : https://github.com/sensiolabs-de/deprecation-detector#composer ?