diff --git a/socketserver/certreloader/reloader.go b/socketserver/certreloader/reloader.go
index 456929f6..4847ee57 100644
--- a/socketserver/certreloader/reloader.go
+++ b/socketserver/certreloader/reloader.go
@@ -1,3 +1,6 @@
+// Copyright 2016 Michael Stapelberg, BSD-3
+//
+// https://stackoverflow.com/a/40883377/1210278
 package certreloader
 
 import (