Recent replicated studies showing low cerebrospinal AVP among individuals with autism indeed suggest a key role for this hormone in autism-related phenotypes (Oztan et al., 2018, 2020; Parker et al., 2018), and longstanding reports of high AVP in acute schizophrenia or psychosis (Raskind et al., 1978; Goldman et al., 1997; Rubin et al., 2013; Guzel et al., 2018) suggest unrecognized impacts in this disorder as well. Here, AVP is linked to autism.