The copy number variant (CNV) module of AutDB is a comprehensive, up-to-date collection of all copy number variants associated with autism spectrum disorders (ASD). CNVs are currently considered to be one of the most common, if not the most common, genetic causes of ASD, with 10-20% of cases believed to result from one or more copy number variants in the genome of an affected individual. For this reason, the CNV module is envisioned to serve as a valuable resource for the ASD research community.