diff --git a/index.php b/index.php
index 3c0fdf5..7fad8f0 100644
--- a/index.php
+++ b/index.php
@@ -37,8 +37,10 @@
         <link href="favicon.png" rel="icon" sizes="192x192">
 
         <!-- Font preloads (should be done for each font file) -->
+        <!-- Open Sans license: fonts/OpenSans/LICENSE.txt -->
         <link href="fonts/OpenSans/OpenSans-Regular.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">
         <link href="fonts/OpenSans/OpenSans-Bold.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">
+        <!-- Open Sans license: fonts/Ubuntu/UFL.txt -->
         <link href="fonts/Ubuntu/Ubuntu-Regular.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">
         <link href="fonts/Ubuntu/Ubuntu-Bold.woff2" rel="preload" as="font" type="font/woff2" crossorigin="anonymous">