Since the recent publication of the Albert Dubois-Pillet catalogue raisonné (March 2018), four paintings by the artist have reappeared on the Parisian art market and will be offered for auction in the second half of 2018: if three of them - two landscapes and the portrait of Paul Boucher -, known only by the text, are already listed in Patrick Offenstadt's catalogue (Nos. 71, 72 and 115), the portrait of "grandfather Boucher" (106 bis) constitutes a complete discovery. It is therefore a first supplement to the Albert Dubois-Pillet catalogue raisonné that we are publishing here.