diff --git a/data/ulsdata2json.php b/data/ulsdata2json.php
index 4626ef64..510eeb50 100644
--- a/data/ulsdata2json.php
+++ b/data/ulsdata2json.php
@@ -32,6 +32,7 @@ $parsed = spyc_load( $data );
 $json = json_encode( $parsed );
 $languageNames = FormatJSON::encode( Language::fetchLanguageNames() );
 $js = <<<JAVASCRIPT
+// This file is generated from data/langdb.yaml by ulsdata2json.php
 ( function ( $ ) {
 	$.uls = {};
 	$.uls.data = $json;
diff --git a/lib/jquery.uls/data/jquery.uls.data.js b/lib/jquery.uls/data/jquery.uls.data.js
index ec6d8c63..9b6c6966 100644
--- a/lib/jquery.uls/data/jquery.uls.data.js
+++ b/lib/jquery.uls/data/jquery.uls.data.js
@@ -1,3 +1,4 @@
+// This file is generated from data/langdb.yaml by ulsdata2json.php
 (function ($) {
 	$.uls = {};
 	$.uls.data = {