pcb design - What are good quality of life additions to a prototype PCB?

What additions are good to add to a prototype PCB that makes your life easier?

I have come across a few nice additions such as:

• Adding useful information on the silkscreen to designate functional areas/pins/traces. Revision number.



• LEDs for power and micro activity.


• Test points at important places in the circuit.


• Connecting a spare communication channel to a header.

Are there others that are helpful?