The Federal Trade Commission (FTC) is probing Reddit’s plan to let artificial intelligence (AI) firms utilize user-generated content to train their software, according to the social media company’s Securities and Exchange Commission (SEC) filing Friday.

The inquiry comes just days before Reddit is slated to complete its initial public offering, after filing for it last month.

Reddit said it received the letter from the FTC Thursday, according to the SEC filing, but clarified the company was not “surprised” by the inquiry.

Reddit said the FTC is conducting “a non-public inquiry focused on our sale, licensing, or sharing of user-generated content with third parties to train AI models. Given the novel nature of these technologies and commercial arrangements, we are not surprised that the FTC has expressed interest in this area.”