A table in the Outlook article 'Nanotechnology: Carrying drugs' (Nature 491 (suppl. 7425), S58–S60; 2012) wrongly stated that Cerulean Pharma's drug CRLX101 is in phase I trials. In fact, it has been in phase II trials since mid-2012. The table also incorrectly gave the company name as “Cerulean Pharmaceuticals”.