It's been disputed between historians, so I put it in and as a disclaimer, I wrote "Includes dynasties that are arguably fictional." The main reason that it's argued to be fictional is because most written texts were either on oracle bones or burned in the Qin dynasty. It's actually really interesting to read about.
If you going to include the Three Kingdoms period, you might as well include Spring and Autumn, as well as the Northern and Southern dynasties, five dynasties and ten kingdoms, e.t.c.