I read in one of the answers on this site that people who are travelling to their country of citizenship do not need to have their passports valid for more than six months. Can someone point me to an official reference for this, please? I cannot find any on the Internet. In case it matters, the place to which I am travelling is Hong Kong.
More context: a couple of weeks after buying my air tickets, the airline e-mailed me a reminder of my flight with the previously unseen condition "ensure that your passport has at least a six months [sic] validity" without any conditional clause. So I am worried that the airline may not let me board the plane.