diff --git a/naming.go b/naming.go
index 2462cab..0f041d8 100644
--- a/naming.go
+++ b/naming.go
@@ -21,6 +21,7 @@ var canonicalDomains = map[string]bool{
 	"metabase":      true,
 	"ml":            true,
 	"notebook":      true,
+	"obsidian":      true,
 	"pipelines":     true,
 	"shell":         true,
 	"tui":           true,
@@ -112,7 +113,7 @@ func validateDomain(domain string) error {
 	}
 	if !canonicalDomains[domain] {
 		return fmt.Errorf(
-			"naming: domain %q not in canonical list. Allowed: browser, core, cybersecurity, datascience, docker, finance, gamedev, geo, gfx, infra, metabase, ml, notebook, pipelines, shell, tui, ui, viz. Add new domain to CLAUDE.md + apps/registry_mcp/naming.go first.",
+			"naming: domain %q not in canonical list. Allowed: browser, core, cybersecurity, datascience, docker, finance, gamedev, geo, gfx, infra, metabase, ml, notebook, obsidian, pipelines, shell, tui, ui, viz. Add new domain to CLAUDE.md + apps/registry_mcp/naming.go first.",
 			domain,
 		)
 	}