You don’t need a touchscreen refrigerator, a WiFi-enabled thermostat or color-changing lightbulbs to pump up the sale price of your home.

In fact, all you need is a black door.

That’s according to online real estate database Zillow, which released an analysis Wednesday after examining some 135,000 photos from listings across the U.S. since 2010. Zillow found that on average, houses with black or charcoal gray front doors sold for as much as $6,271 more than expected.

Click to read the full article from Money.