/* Yorick comments begin with slash-asterisk,
   and end with asterisk-slash. A comment
   of any size is treated as a single blank. */

Since /* ... */ comments do not nest properly, Yorick supports C++ style comments as well:

  statement   // remainder of line is comment (C++)
  // Prefix a double slash to each line to comment out
  // a block of lines, which may contain comments.