Our Quality Policy has a document # and rev level in case it changes the employees are aware of the current revision. But you should conduct training for the Quality Policy and document this training so the auditor knows you explained the policy to employees. During training, you want to make sure the employees can connect the quality policy to their job duties so gain a better understanding. Usually an auditor will ask employees to explain the Quality Policy in their own words so simply reading a poster may not be enough to effectively communicate your Quality Policy.