xiaobaitu and daxiamen bang wo yi xia

If I filed the I-140 and I-485 for application of the green card before I change my job (change job between different departments or institutes, but keep in the similar field, such as thebiology). but before the I- 140 approved I already changed my job, then if I received the RFE , such like recommendation letter, my current research work. how should I do next step?