COMMENT -- To comment is to remark on or say something about the topic of a discourse. A comment frequently takes the form of an explanation of a fact, an interpretation of a difficult statement, or an evaluation of an example. Comments are a typical part of paragraph development in expository writing. An expository paragraph usually opens with a topic sentence and then present facts, examples, or some other form of evidence to support the topic sentence. The writer then explains or evaluates the evidence with appropriate comments. Useful comments should make clear the relevance of the evidence to the topic. Dependency analysis of expository paragraphs reveals that comments are subordinate to the the ideas that they talk about.