This library is called class_docu_shower. It will display the header of a .rb file in question. For this to properly function, you should use 3 '=' characters, followed by the name of the class, and delimited via '# =====' entries. Example: '=== Menu' Without the '' quotes. There also is an executable at bin/class_docu_shower. Pass it the path to a .rb file and it will output the top header comment.