> ## Documentation Index > Fetch the complete documentation index at: https://docs.incident.io/llms.txt > Use this file to discover all available pages before exploring further. # Catalog > Your catalog gives Nexus the map of your systems, services, and ownership. The [catalog](/catalog/catalog-setup) is where incident.io holds the structure of your organization: your services, the teams that own them, and how everything depends on everything else. It's one of the richest things Nexus knows about you, and it works across the whole platform, not just investigations. For Nexus, the catalog is the map. When an investigation traces a problem to a service, the catalog is what tells it who owns that service, what it depends on, and what depends on it, so a finding lands with the right team and its blast radius is clear. Set up the catalog and understand how it's structured. Populate the catalog from Backstage, Cortex, OpsLevel, and other sources. Model your teams and connect them to the services they own. Decide what belongs in your catalog and how to shape it.