Any file or folder under Ubuntu can have notes attached to it. This might be considered a solution waiting for a problem in some people's eyes but it's a cool feature nonetheless. To add a note to a file or folder, right-click it and then select Properties from the menu that appears. Then click the Notes tab in the dialog box that appears and type what you want. Click Close when you've finished. Following this, the file or folder icon will have a note emblem in one of its corners (probably the top-right).
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