Addendum to "Maximal regularity and Hardy spaces"
  We correct an inaccuracy in a previous article [Auscher, Pascal; Bernicot, Fr\'ed\'eric; Zhao, Jiman. Maximal regularity and Hardy spaces. Collect. Math. 59 (2008), no. 1, 103-127.] 
Pascal Auscher (LM-Orsay), Fr\'ed\'eric Bernicot (LM-Orsay), Jiman   Zhao