  Wu et al. (2019) proposed the disruption index (DI1) as a bibliometric
indicator that measures disruptive and consolidating research. Leibel and
Bornmann (2024) recently published a literature overview on the disruption
index research in Scientometrics. In this letter to the editor, we point out
that the method of calculating the DI1 score of a focal paper contains a
logical impact measurement error that leads to a meaningful reduction of the
score. We explain why this is problematic and propose a correction of the
formula.
