diff --git a/internal/topic/repository.go b/internal/topic/repository.go
index e8371d4..2f04e3a 100644
--- a/internal/topic/repository.go
+++ b/internal/topic/repository.go
@@ -14,8 +14,11 @@ type (
 	Repository interface {
 		Create(ctx context.Context, u *url.URL, topic domain.Topic) error
 		Update(ctx context.Context, u *url.URL, update UpdateFunc) error
+		// TODO(toby3d): search by URL prefix for publish every topic on
+		// domain or it's directory.
 		Fetch(ctx context.Context) ([]domain.Topic, error)
 		Get(ctx context.Context, u *url.URL) (*domain.Topic, error)
+		// TODO(toby3d): Delete(ctx context.Context, u *url.URL) (bool, error)
 	}
 )