Techniques are provided for sending an acknowledgment from a station to an access point in response to a multi-user transmission, which may include receiving a multi-user transmission addressed to a multi-user group including the station, determining a response position of the station in a sequence of responses based on an order of the station in the group, and sending the acknowledgment in the determined response position. Techniques are also provided for ordering acknowledgments from a group of stations addressed in a multi-user transmission from an access point, which may include selecting a group identifier to identify the group of stations to receive the multi-user transmission, configuring a header portion of the multi-user transmission to indicate a Sequential ACK acknowledgment policy for station responses based on an order of the stations in the group, and transmitting the multi-user transmission to the group.