Adding comments allows you to return to a line of code and understand what task it is performing. 
Note: The Visual LISP IDE is available on Windows only. 
- In the Visual LISP IDE, click Tools 
 Environment Options 
 Visual LISP Format Options.  
- In the Format Options dialog box, Closing Parenthesis Style, select Close At the New Line with Inner Indentation or Close At the New Line with Outer Indentation. 
 
- In the Form-closing Comment Prefix box, enter a new value. Click OK.