This corrigendum proposes changes to correct the following three defects: 1) The standard currently proposes attaching a UML comment to a piece of behaviour to express that it requires, creates or fulfils an obligation, permission, prohibition or authorization i.e. to express deontic rules. Concerns have been expressed about the traceability and management of UML comments, particularly in the specifications of very large-scale systems. 2) The standard currently uses the UML construct "note" where it should use "comment" 3) The standard has a typographical error in the cardinalities of figure 9.