Consistent with Symfony's source code, the documentation repository is split into

multiple branches: ``2.0``, ``2.1``, ``2.2`` corresponding to the different

versions of Symfony itself. The ``master`` branch holds the documentation

for the development branch of the code.

multiple branches, corresponding to the different versions of Symfony itself.

The ``master`` branch holds the documentation for the development branch of the code.

Unless you're documenting a feature that was introduced *after* Symfony 2.1

(e.g. in Symfony 2.2), your changes should always be based on the 2.1 branch.