diff --git a/README.md b/README.md
index 73b56ef..7e0b585 100644
--- a/README.md
+++ b/README.md
@@ -126,6 +126,8 @@ from ohmyapi.db.exceptions import DoesNotExist
 
 from .models import Tournament
 
+# If <app>.routes.router exists and is an APIRouter, OhMyAPI will
+# automatically pick it up and add it to the app's main APIRouter.
 router = APIRouter(prefix="/tournament")