If you are concerned about advertising injury (libel, slander, etc) caused by your own company’s marketing and promotional material, request to add General Liability coverage to your Media and Marketing Insurance policy. But General Liability does not cover the work you do for your clients. If you are concerned about advertising injury caused by the work you do for your clients, add Errors & Omissions coverage to your insurance policy. Errors & Omissions Insurance provides coverage for damages caused by errors and omissions in your services.