diff --git a/demo/index.html b/demo/index.html
index 580acf4b..1d480d20 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -9,7 +9,7 @@
     <nav>
       <header> ReDoc </header>
       <form id="schema-url-form">
-        <input id="schema-url-input" value='swagger.json'>
+        <input id="schema-url-input" value='swagger.yml'>
         <button type="submit"> Explore </button>
       </form>
     </nav>