diff --git a/TODO b/TODO
index 682603b..24600a7 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,7 @@
 key handler on $container instead of window?
 fix get_next/prev_page
+change $pages to object and store indices into an array
+next/prev for each Page ?
 
  - dots issue
   - AdobeXML*.pdf
diff --git a/share/manifest b/share/manifest
index 202b2ea..bbd14b5 100644
--- a/share/manifest
+++ b/share/manifest
@@ -39,6 +39,8 @@ $css
 @jquery.js
 @pdf2htmlEX.js
 # entry point 
+# You can override default configuration by passing an object to the constructor of Viewer
+# Refer to DEFAULT_CONFIG in pdf2htmlEX.js for possible keys
 """
 <script type="text/javascript">
 try{
diff --git a/share/pdf2htmlEX.js.in b/share/pdf2htmlEX.js.in
index ec8682a..2aca598 100644
--- a/share/pdf2htmlEX.js.in
+++ b/share/pdf2htmlEX.js.in
@@ -233,6 +233,8 @@ var pdf2htmlEX = (function(){
           url: url,
           dataType: 'text'
         }).done(function(data){
+          // replace the old page with loaded data
+          // the loading indicator on this page should also be destroyed
           _.pages[idx].$d.replaceWith(data);
 
           var $new_pf = _.$container.find('#' + CSS_CLASS_NAMES['page_frame'] + page_no_hex);