I'm writing a help document for an application and I'm unsure of the correct grammar for the following statement:
A confirmation dialog will then appear showing the number of items that will be modified by the operation.
A confirmation dialog will then appear showing the number of items which will be modified by the operation.
I've been reading & re-reading these statements over and over in my head and both seem to sound fine.
Is there a rule to determine when one should use that will and when one should use which will?
Many thanks in advance for your time.