Good comments do frequently answer the why question and, sometimes, the non-obvious what. It's generally true that the code expresses the what, but it's also t

Good comments do frequently answer the why question and, sometimes, the non-obvious what. It's generally true that the code expresses the what, but it's also true that it can take the reader time to discern. A simple comment here and there can be a shortcut to this discernment which, over thousands of lines of code can save serious time.