This document discusses the importance of supporting content in content marketing campaigns. It defines supporting content as additional materials that reinforce the main campaign assets, such as interviews, features, visual assets, and case studies. These materials can help take campaign ideas in new directions and activate trending conversations. The document recommends integrating supporting content into the ideation process from the start. It provides examples of how supporting content expanded the reach and impact of campaigns for an addiction charity and a beer company, resulting in increased coverage, social engagement, and traffic. The key message is that campaigns should not neglect supporting content and should plan it alongside main assets.