diff --git a/themes/bootstrap3/templates/layout/layout.phtml b/themes/bootstrap3/templates/layout/layout.phtml
index 576ad084f7e604915512bfa3beb4e9f36d16b611..d3b73b816d6981b1cc1992d242885d4622cd463c 100644
--- a/themes/bootstrap3/templates/layout/layout.phtml
+++ b/themes/bootstrap3/templates/layout/layout.phtml
@@ -124,7 +124,7 @@ JS;
     ?>
     <header class="hidden-print">
       <div class="container navbar">
-        <? if (isset($this->layout()->srmessage)): ?>
+        <? if (isset($this->layout()->srmessage)): // message for benefit of screen-reader users ?>
           <span class="sr-only"><?=$this->layout()->srmessage ?></span>
         <? endif; ?>
         <a class="sr-only" href="#content"><?=$this->transEsc('Skip to content') ?></a>