Update index.html

index.html

@@ -607,7 +607,7 @@ <h3>
         <aside class="note" title="Default scope">
           <p>
             The "default scope" (when [=manifest/scope=] member is missing,
-            empty, or failure) is the [=start URL=], but with its filename,
+            empty, or failure) is the [=manifest/start URL=], but with its filename,
             query, and fragment removed.
           </p>
         </aside>