Passage: ISO also sometimes issues "technical corrigenda" (where "corrigenda" is the plural of corrigendum). These are amendments made to existing standards due to minor technical flaws, usability improvements, or limited-applicability extensions. They are generally issued with the expectation that the affected standard will be updated or withdrawn at its next scheduled review.ISO guides

Question: What are ISOs?
amendments made to existing standards due to minor technical flaws, usability improvements, or limited-applicability extensions