Exp Fluids (2003) 35:8–23

Petrie et al. (2003) presents a study of the effects of surface roughness on slot-injected and homogeneous polymer drag reduction. The polymer injection slot used in this study, shown in Fig. 2 of the paper, was developed by Moore et al. (2002) who holds a patent on this device. Appropriate credit for the development of this injection slot was not acknowledged in the paper. A detailed discussion of the features of this injection slot, its theory operation, and its utility can be found in Moore et al. (2002).