Applying a content warning to metadata and archival descriptions is a practice that libraries increasingly embrace, even though the American Library Association considers content labeling to be censorship under the Library Bill of Rights. The language used in a content warning, such as "offensive" or "harmful," carries important implications for the responsibility the library assumes and the actions it might take. Before deciding to apply a content warning, libraries should consider a range of questions posed by such warnings and be prepared to respond to the inherent conflict they create with librarianship's commitment to intellectual freedom and anti-censorship.