Letter to the editor on "new algorithmic approach for easier and faster extended disability status scale calculation".

We stated that “Most of them provide little information about the specific rules used to estimate the FS scores and EDSS steps” and “None of these tools give a clear way to calculate the FS based on a complete neurological assessment.” In fact, we were not the first to make such observations, D’Souza and colleagues made the same observations regarding these electronic applications in a study they published in 2017.