Retractions of scientific papers are increasing and most are due to misconduct such as image manipulation or faked data. However, journals do not always adequately notify readers of retractions. Studies have found that only 6-8% of citations to retracted papers acknowledge the retraction. Post-publication peer review on sites like PubPeer are becoming more common and helping to catch errors or misconduct that were missed during the initial peer review process. Journals are starting to respond to issues raised on sites like PubPeer but more transparency is still needed regarding retractions.