Related Clues:

• It might have the heading 'Re:'
• Supervisor's note
• 'Consider ...'
• Quick jotting
• A or E, but not I, O or U
• Step on a scale?
• Music part
• In-box note, perhaps
• Post-it jotting
• Bank robber's aid
• Permission slip
• Post-it item
• Observe the musical pitch.
• Brief written record
• Written message