For very large formulas it is a good help to comment parts of the formula directly, likely as in software sources.
Formulas therefore can contain comments:
Line comment:
Starts with // and ends with the end of the line
Example:
mc.$Ort // line comment
Block comment:
Starts with /* and ends with */
Example:
if /*Block comment*/ mroot.
Nested comments:
Example:
/* This is a /* nested */ comment */