symfony/symfony-docs — comment on commit a6822804dd4765b51a562799e63edf5e14ba6a2e
File: book/templating.rst line 1155
By stof:

2.0.8 in fact as it is added in Twig 1.5.0

The 2.0.9 release has been done a few days later to upgrade to Twig 1.5.1 to fix a regression