Is it recommended to put capacitance on the nRST pin?

[mark.blackburn.orpyx]

Is it a good/bad idea to put capacitance on the nRST line. I noticed the nrf52840 DK does not have any capacitance on the nRST line. At least none that I can find, tracing that signal on the schematic is a bit tough.

There is 100 pF on the 52840 dongle schematic that I found on this post: 

https://devzone.nordicsemi.com/f/nordic-q-a/58703/nrf52840-dongle-v1-2-0-schematic

We don't have any capacitance on our design. It is also a lot smaller that the 52840 DK layout wise.

Some of our product will not stay in the bootloader. I was wondering if not having any capacitance might be causing this problem. I suspect the the 52840 DK has enough stray capacitance to keep it reliable, whereas we don't have as much stray capacitance.

Thanks,

[ketiljo]

There are on-chip reset circuitry on the device including pull up, so external capacitor and resistor is not needed. But it doesn't harm to place the usual 10 kohm / 100 nF on the pin. 

The USB dongle has this to make the reset line a but more robust since the board doesn't have a housing.