ðɪ ɐdˈɪʃənz bɪkˌeɪm ɪfˈɛktɪv wɪððə tˈuː θˈaʊzənd ˈeɪtiːn dˈæʃ tˈuː θˈaʊzənd nˈaɪntiːn skˈuːl jˈɪɹ, mˈɑːɹkɪŋ ðə fˈɜːst ɛkspˈænʃən ʌvðə kˈɑːnfɹəns sˈɪns nˈaɪntiːnhˈʌndɹɪd nˈaɪnti tˈuː, wɪððɪ ˈoʊnli tʃˈeɪndʒ kˈʌmɪŋ ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˈeɪt wɪð zˈeɪviɚz ˈoʊpənɪŋ.
The additions became effective with the 2018-2019 school year, marking the first expansion of the conference since 1992, with the only change coming in 1998 with Xavier's opening.