Customers dining in certain foodservice establishments in New York City will see a new icon on Dec. 1 alerting them to the presence of products with 2,300 mg or more of sodium — the total recommended daily limit. With the announcement, New York City becomes the first city in the nation to require chain restaurants to post warning labels next to menu items that contain high levels of sodium.

The icon, a salt shaker inside of a triangle, must be posted next to items with 2,300 mg or more of sodium in foodservice establishments that are part of chains with 15 or more locations nationwide. The restaurant chains will have 90 days to comply with the new rule before the possibility of receiving a fine. The proposal was passed unanimously on Sept. 9 by the New York City Board of Health.

According to the New York City Board of Health the rule will apply to combo items, such as an order-by-number meal that might include a soup and a sandwich or a burger and french fries. The rule also requires chain foodservice establishments to post a warning statement where customers place their orders. The warning statement must explain that items with the icon have more than the recommended daily limit of sodium and that high sodium intake may increase blood pressure and risk of heart disease and stroke.