Since the risk has a low impact, it is best to add the risk to the watch list and see if it's impact will be greater down the road. Risks will always present themselves on projects, you need to decide which one of them are important enough to stop you from creating the final deliverable as required within the cost and schedule. This is why you have a list of prioritized risks which you need to address. It is not worth spending time and money on a risk with low impact.