Have you ever noticed a tiny arrow next to the fuel pump icon on your car's gas gauge? Well, if you have, but were never really quite sure what it meant, we're here let you in on a little secret.

That little arrow tells you which side of your car the fuel cap is located on.

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Brilliant, right?! It's an especially helpful feature if you're driving a rental car, but also pretty handy in your day-to-day life if you're one of those people who can just never remember whenever you pull into a gas station.

According to Slate, the arrow has appeared in most new cars since around 2010 or so, making it pretty standard by now. (Maurice Durand, an engineer for Toyota, told the website that in older cars, sometimes the side of the pump icon the hose appears on indicates which side of the car has the fuel cap). Yet many people still don't know about this smart little addition (an informal survey of my coworkers revealed that only about half of them were aware of it).

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The more you know, right?