In an embodiment, a technique for generating a comment for an entity associated with a model. The comment may be generated based on at least (1) a structural usage of the entity and (2) a dynamically-specified rule that is associated with the structural usage of the entity. The rule may be used to control content of the comment. The comment may be incorporated in generated code for the model and the generated code including the comment may be outputted (e.g., displayed, stored).