If you work as a team of administrators lording over an enterprise-wide Group Policy deployment, you might want to comment or otherwise document directly in the system what certain configurations you've set up actually do. Enter the commenting feature, which allows you to document right on a setting what that function is intended to accomplish. Your peers can also search on your comments using the comment as the criteria in their query.
To enter a comment:
Open the Group Policy Management Console.
In the left pane, find the GPO in question and right-click on it to bring up the context menu; select Edit.
Right-click on the very top-most node in the left pane (it should be the name of the GPO) and select Properties.
Navigate to the Comment tab.
Enter the comment as you wish, and then click OK.