What sorts of remarks are appropriate for the remarks section of the flight plan?

The remarks section of a flight plan should include pertinent information that aids air traffic control and other pilots. This can include details such as the aircraft's type, any special equipment on board, intentions for altitude changes, and specific flight routing. Additionally, it may contain notes on any potential hazards, unusual flight conditions, or requests for specific services. Overall, the remarks should be concise, relevant, and enhance safety and communication.