Why is C6 not populated on the nRF52810 reference design

[ashwin]

I refer to nRF52810 product specification v1.1 In all reference designs, C6 is N.C.

I would like to know why this is the case? 

I would also like to know why it is included in the ref design, if it does not need to be populated under any circumstances (or does it)? 

[RK]

https://devzone.nordicsemi.com/f/nordic-q-a/23226/grounding-of-dec2-pin-on-nrf52832

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