symfony/symfony-docs — pull request #1994 by Sgoettschkes (2012-12-01 16:34:19+00:00)
Title: Adding a link to composer and mentioning the installation of it.

Right now, components/using_components.rst does not contain a link to composer. It also doesn't say how to install composer.

I think it is important to state that one has to install composer just for completion. It might confuse people if they don't know about composer, reading the documentation and don't find any hint on the installation of composer.