[TX] Anything specific I should say or avoid when requesting FMLA time?

In a couple months I'm scheduled for some major surgery. My surgeon has said I'll need to be off work for 6 weeks. I'm .80 FTE benefits-based and salaried for a Texas state employer (public university). Protocol is to tell your boss, and they contact HR on your behalf to get the paperwork started. Is there anything I should be sure to state or avoid for this conversation? I plan on being vague with boss about my health condition. Planning on stating that I received some challenging health news recently that will require surgery and a 6-week recuperation and then pivot that I'm expecting a positive outcome in the long run.