Is There An Interaction Between Lisinopril And Potassium In Foods?

Is there an interaction between lisinopril and potassium in foods? I've been told to watch dietary consumption, and my lab showed only .2 over the top of the normal range. Does this mean that a slight elevation of serum potassium is more of a problem to me than if I were not taking lisinopril? Is this important because of my already somewhat inadequate kidney function and the prospect that my myeloma will cause further kidney function deterioration?