A joinery for a building opening, said joinery comprising: (i) a frame that includes a top rail intended to extend along a lintel of said opening, and at least two jambs, (ii) at least one sliding leaf carried by said frame, provided with a glazing, that includes a top rail and at least two jambs, (iii) an inner box, in which are placed operating means cooperating with a first "motorised" sliding leaf, for the sliding of the latter, said first sliding leaf being equipped, at a first jamb, with lock means comprising: - at least one bolt intended to cooperate with a complementary strike equipping a first jamb of said frame, - a rotary actuator for operating said at least one bolt between a lock position and an unlock position with respect to its complementary strike, the operating means comprising: - motor means that are implanted in the inner box, and - transmission means that are designed to operate said first sliding leaf in translation and to operate the rotary actuator thereof in rotation, in that said operating means cooperate with said rotary actuator in such a way as to operate said at least one bolt between said lock and unlock positions, and in that said lock means include a visual indicator that is movable through an aperture, in that said visual indicator cooperates with said at least one rotary actuator via connection means adapted to generate the operation thereof between two positions, i.e.: - a retracted position, with respect to said aperture, and - an extended position, through said aperture, corresponding to said lock position and unlock position of said at least one bolt. (i) a frame that includes a top rail intended to extend along a lintel of said opening, and at least two jambs, (ii) at least one sliding leaf carried by said frame, provided with a glazing, that includes a top rail and at least two jambs, (iii) an inner box, in which are placed operating means cooperating with a first "motorised" sliding leaf, for the sliding of the latter, said first sliding leaf being equipped, at a first jamb, with lock means comprising: - at least one bolt intended to cooperate with a complementary strike equipping a first jamb of said frame, - a rotary actuator for operating said at least one bolt between a lock position and an unlock position with respect to its complementary strike, - at least one bolt intended to cooperate with a complementary strike equipping a first jamb of said frame, - a rotary actuator for operating said at least one bolt between a lock position and an unlock position with respect to its complementary strike, the operating means comprising: - motor means that are implanted in the inner box, and - transmission means that are designed to operate said first sliding leaf in translation and to operate the rotary actuator thereof in rotation, - motor means that are implanted in the inner box, and - transmission means that are designed to operate said first sliding leaf in translation and to operate the rotary actuator thereof in rotation, in that said operating means cooperate with said rotary actuator in such a way as to operate said at least one bolt between said lock and unlock positions, and in that said lock means include a visual indicator that is movable through an aperture, in that said visual indicator cooperates with said at least one rotary actuator via connection means adapted to generate the operation thereof between two positions, i.e.: - a retracted position, with respect to said aperture, and - an extended position, through said aperture, - a retracted position, with respect to said aperture, and - an extended position, through said aperture, corresponding to said lock position and unlock position of said at least one bolt.