Animating with the Channel Editor > Expressions > Defining Your Own Functions >
Comments

You can include comments in the functions file by starting the line with a number sign ( # ). The comments extend through the end of the line on which they appear and are ignored by Flame when the user-defined functions file is interpreted. Comments are useful for describing the purpose of a function and adding any notes you feel are pertinent. They can be introduced anywhere in the file, except for inside of function definitions that span several lines.