Nature Communications, Published online: 27 May 2026; doi:10.1038/s41467-026-73750-5 There are several examples of ferroelectric altermagnetic materials; however, it remains an active question as to whether an electric polarization can be induced by altermagnetic spin ordering. Here, Guo, Xu and coauthors demonstrate a link between the electric polarization vector and the altermagnetic Néel order parameter, which unambiguously realizes type-II multiferroicity.