Moving back to old employer while the I-94 is still valid.

[erricster]

Hi, can I please know if i can go back to my old employer after working for current employer for 2 years.
My old employer I94 is still valid for 8 more months. I have visa stamping of my current employer which is valid till 1 more year.

If there is something like addendum needs to be done for this?

thanks.