diff --git a/README.md b/README.md
index 8ca8e57..48d6461 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,9 @@
 import "code.nochebuena.dev/einherjar/smtp"
 
 mailer := smtp.New(logger, smtp.DefaultConfig())
-launcher.Append(mailer)   // OnInit verifies credentials; OnStop is a no-op
-health.Register(mailer)   // dial check; LevelDegraded
+lc.Append(mailer)   // OnInit verifies credentials; OnStop is a no-op
+// mailer is observability.Checkable (dial check, LevelDegraded):
+srv.Get("/health", health.NewHandler(logger, mailer).ServeHTTP)
 ```
 
 When `cfg.Host` is empty, `New` returns a no-op that logs every `Send` call at debug level and always returns nil. No code changes are needed between environments.
diff --git a/doc.go b/doc.go
index f1c67c7..6e2c3de 100644
--- a/doc.go
+++ b/doc.go
@@ -12,8 +12,12 @@
 // # Lifecycle Registration
 //
 //	client := smtp.New(logger, cfg)
-//	launcher.Register(client)
-//	health.Register(client)
+//	lc.Append(client) // lifecycle: OnInit → OnStop
+//
+// client satisfies [observability.Checkable], so it can back a health endpoint via
+// web/health.NewHandler:
+//
+//	srv.Get("/health", health.NewHandler(logger, client).ServeHTTP)
 //
 // # Sending
 //