The Comment function is used to describe the functionality of an action. The function is ignored when the action is run. The comment is displayed as text following a single quote character. eg.
' This is a comment
Tip: You can provide a tooltip for a Custom Panel action button by placing a Comment statement anywhere in an action which begins with Tooltip: (case insensitive, no leading spaces). All text following the Tooltip: header will be assigned as the button's tooltip. eg.
' Tooltip: This action will...