In the article entitled “The Story of CD4⁺CD28⁻ T Cells Revisited: Solved or Still Ongoing?” [1], we wrote the following in Section 2.3. (Increased Replicative History and Reduced Apoptosis) about the telomere length and the “Hayflick limit”: “when the telomeres reach a critically short length, the cells are senescent and undergo apoptosis .” It has to be corrected as follows: “when the telomeres reach a critically short length, normal human cells become senescent .”