Today, I received an email informing me that an open-source software I use has a bug and that an article I wrote may be affected. It is a small and hard-to-detect error that anyone could have made. Of course, it is concerning that I may have drawn incorrect conclusions in the article due to faulty results, but it is encouraging and gratifying that the author is so responsible and helpful. A new version is available, and (hopefully) the only thing I need to do is redo my calculations.