Rules for coding comments

You can write comments after the operand field, but they must be separated from the last operand of the operand field by one or more blanks. Comments can be continued to the next line, but they must start in column 17 or beyond. An entire line can be used for a comment by placing an asterisk (*) in the first column of the line. If you need several entire lines for comments, place an asterisk in the first column of each line and leave column 72 blank. A definition statement or macroinstruction that has no operands cannot have comments on the same line as the operation code.