diff --git a/readability.go b/readability.go
index c6776ae..59f0128 100644
--- a/readability.go
+++ b/readability.go
@@ -1,6 +1,8 @@
 // Copyright 2017 Frédéric Guillot. All rights reserved.
 // Use of this source code is governed by the Apache 2.0
 // license that can be found in the LICENSE file.
+//
+// See https://github.com/miniflux/v2/blob/4e181330d024c0c3302313dd17e0741c9d417783/internal/reader/readability/readability.go
 
 package readability