An advocacy group is calling on Meta to allow Facebook users to list more than one romantic partner in their profiles. In a letter the Organization for Polyamory and Ethical Non-monogamy (OPEN) sent to the social media giant on Thursday, it said the current design of Facebook’s relationship status feature is “exclusionary” towards people who practice ethical non-monogamy. The group has asked that Meta allow users to tag all their romantic partners.

“At best, this restriction perpetuates the erasure and marginalization of non-monogamous relationships; at worst, it harms non-monogamous users by perpetuating social stigmas around the validity and authenticity of their relationships,” OPEN said.

A Meta spokesperson told The New York Times the company is reviewing the letter and noted that Facebook already allows users to mention on their profile that they’re in an “open relationship” with one or more people. The timing of the request may seem curious given Facebook’s declining daily userbase, but it’s in line with the growing number of people who find themselves in non-monogamous relationships. According to data cited by OPEN, about four to five percent of American adults practice ethical non-monogamy.