"Addition content" refers to extra material or information that is added to the original content. This additional content can provide further details, explanations, or enhancements to the main subject or topic. Full definition
Learn assessment techniques in addition content relevant to learners in grades 1 - 8. (livecareer.com)
The only addition content that I recommend is a space on your site for sharing blog posts and firm updates. (rocketlawyer.com)
As Pikmin 3's DLC continues to roll out with addition content for player to sink their teeth into, brand new Super Mario 3D World content has made it first appearance here. (co-optimus.com)