You have logged a long note and suddenly understand that there is a mistake. Some mistakes, such as misprints, are just irritating. Others, such as commercial offer peculiarities, might have critical consequences since they mislead you or your colleagues. Faced that situation Odoo users attach a new message. However, it is a bad option: everything becomes ambiguous, and contradictions disorient users. The proper solution is to update a current note, but to keep a clear history of changes for references. The app is the tool to address this challenge.