Formula comments are notes included with a formula to explain its design and operation. Comments do not print and they do not affect the formula; they appear only in the Formula Editor. Use comments to explain the purpose of a formula or explain the steps involved in writing it.
Comments begin with two forward slashes (//) and are followed by the text of the comment. Everything that follows the slashes on the same line is treated as being part of the comment:
//This formula returns the string "Hello" //This is another comment "Hello" //Comments can be added at the end of a line //Comments can occur after the formula text