In standard wavefield synthesis (WFS) configurations with just horizontal loudspeaker arrays one gets a convincing reproduction of sonic content in the horizontal plane. But for a complete immersive experience you are missing sound coming from the upper hemisphere. Equipping the whole hemisphere would be very cost intensive and unrealistic, so a solution with effective arrangements of additional sources is sought. The design and implementation of ceiling speakers for a WFS system is the subject of this paper. Basic concept for implementation is the knowledge of the less precise localization in the upper space. Due to safety regulations, the ceiling speakers have to be lightweight to reduce risk for listeners. The arrangement can also be done with less effort. Based on these considerations, our approach is to cover the ceiling surface of a reproduction room with small fullrange speakers with an enclosure made of styrofoam, which are driven with a relatively small number of discrete audio channels to cover the whole upper space. - The rendering software of the WFS system at University of Applied Sciences Duesseldorf was updated to synthesize sound sources in and above the ceiling area of the WFS studio and to fit the acoustic properties of the new configuration. Within the software, the generation of discrete and diffuse sound components is possible. As a result, the immersion in artificial auditory environments is significantly improved with only little effort.