The special comments that make up Foundation Express directives begin, like all Verilog comments, with the characters // or /*. The // characters begin a comment that fits on one line (most Foundation Express directives fit on one line). If you use the /* characters to begin a multiline comment, you must end the comment with */. You do not need to use the /* characters at the beginning of each line, only at the beginning of the first line.
Note: You cannot use // synopsys in a regular comment. In addition, Foundation Express displays a syntax error if Verilog code is in a
// synopsys directive.