This module will improve the user experience when the site has some blocks the user may show or hide. Currently drupal doesn't support block descriptions, and when there are some site created blocks or blocks with similar names the user may be confused about wich one is each.
The module introduces the field description in the block configuration form, as this is the place where the administrator should first enable the user interaction with the block visibility. Once the user goes to edit the account settings to show or hide the site blocks, each block will have it's description attached.
Note: As blocks are being refactored completely for D7, an interesting topic to read about: