An apparatus for controlling the motion of a top-hung sliding door. The apparatus has a biasing member, a door engagement member coupled to the biasing member for releasably engaging a flange extending from a door hanger from which the sliding door is supported, and a body defining a path for the door engagement member. A first end of the path is configured such that the door engagement member may be releasably retained at the first end of the path, whereby when the door engagement member is retained at the first end of the path and the door engagement member is contacted by the flange: the door engagement member is configured to engage the flange, and the biasing member is configured to extend and move the door engagement member to a second end of the path.