Mariska van Hartskamp should have been listed as third author for this article, the authors therefore wish to revise the author list to read as follows: Ákos T. Kovács, Tom H. Eckhardt, Mariska van Hartskamp, Richard van Kranenburg, Oscar P. Kuipers Mariska van Hartskamp is affiliated at Purac, Gorinchem, The Netherlands. The correct citation is: Kovács ÁT, Eckhardt TH, van Hartskamp M, van Kranenburg R, Kuipers OP (2013) Functional Analysis of the ComK Protein of Bacillus coagulans. PLoS ONE 8(1): e53471. doi:10.1371/journal.pone.0053471 The authors' contributions should be revised to read as follows in order to acknowledge Ms van Hartskamp's contribution: Performed the experiments: ATK, THE, MvH. In addition, the affiliation details for Richard van Kranenburg should be revised to read as Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands and Purac, Gorinchem, The Netherlands.