The end of life of Jelix 1.6 was expected in february 2017, so bug fixes and security fixes were not provided beyong this date. However, the release of Jelix 1.7 has been delayed (it is planned before the end of the year), and developers won't have many time to migrate.

This why the support of Jelix 1.6 is extended by one year, until february 2018.

Update 01/16/2018: support extended until december 2018.