Man pages matching name explain_adjtimex_or_die in section 3:

explain_adjtimex_or_die.3.en	debian 10 / libexplain-dev
explain_adjtimex_or_die.3.en	debian 11 / libexplain-dev
explain_adjtimex_or_die.3.en	debian 12 / libexplain-dev