Just received this from ESA Mission Director Thomas Beck, on console today at ATV-CC, Toulouse.

The first reboost of the ISS by ATV-5 has been carried out successfully.

The freighter’s main thrusters M1 and M3 were ignited today at 18:58:00 CEST (16:58:00 GMT) and burned for 469 secs using up 151.6 kg of propellant. The manoeuvre increased the ISS’s velocity by about 1.1 m/sec.