khmer version & citation clarification Michael Crusoe, University of California, Davis 23 November 2015 There is no version 0.2 of khmer; we suspect that the authors used version 2.0, as that matches their citation. We appreciate the citation of our software though we request that both the software and the matching algorithm paper be cited. The authors did not specify which script in khmer was run, but by context we presume it was `normalize-by-median.py`, therefore the corresponding algorithm citation is "CT Brown et al., arXiv:1203.4802 [q-bio.GN]" as specified in the documentation and the "--help" output of that script. Finally we would like to highlight a formatting error concerning the command line options used as one of the dashes was replaced by an "em" dash. The correct formatting of the options to normalize-by-median.py is "-K 20 -C 20" or "--ksize 20 --cutoff 20" if using the long versions of the parameter names. Competing interests I was the lead developer of khmer from version 0.6 through to version 0.8.