The rules for coding JES3 control statements are the same as the rules for JCL statements, with the following additions:

• Columns 1, 2, and 3 generally contain the characters //* (slash-slash-asterisk). Some JES3 control statements may contain, and certain other JES3 control statements must contain only a single slash-asterisk (/*) in columns 1 and 2.
• Columns 3 and 4 must not be blank.
• To code a comment on a JES3 control statement, code a blank after the control statement, and end the comment before column 72. Columns 73-80 are ignored by z/OS® and are typically used for sequence numbers.