Question about Junction deviation and Jerk

Hi all, I have my custom printer working pretty well now and I'm experimenting with the Junction deviation settings along with linear advance.
Articles on lin advance talk about the extruder jerk settings. With junction deviation it says the jerk settings are disabled and the M503 only shows the J value.
The question is does JD control the jerk on the extruder also or does the extruder jerk setting still work even though it is not reported? The M205 E value is still accepted and marlin reports OK but how does it all work together?

Thanks

When using Junction Deviation the extruder jerk is automatically calculated based on the JD value and the maximum extruder acceleration. The value set with M205 is ignored.