diff --git a/demo/bootstrap.php b/demo/bootstrap.php
index 0a7bb3b..21bdb42 100644
--- a/demo/bootstrap.php
+++ b/demo/bootstrap.php
@@ -7,8 +7,11 @@ use DebugBar\StandardDebugBar;
 $debugbar = new StandardDebugBar();
 $debugbarRenderer = $debugbar->getJavascriptRenderer()->setBaseUrl('../src/DebugBar/Resources');
 
-$debugbar->setStorage(new DebugBar\Storage\FileStorage(__DIR__ . '/profiles'));
-$debugbarRenderer->setOpenHandlerUrl('open.php');
+//
+// create a writable profiles folder in the demo directory to uncomment the following lines
+// 
+//$debugbar->setStorage(new DebugBar\Storage\FileStorage(__DIR__ . '/profiles'));
+//$debugbarRenderer->setOpenHandlerUrl('open.php');
 
 function render_demo_page(Closure $callback = null)
 {
diff --git a/docs/javascript_bar.md b/docs/javascript_bar.md
index 1a44db0..be4f251 100644
--- a/docs/javascript_bar.md
+++ b/docs/javascript_bar.md
@@ -1,5 +1,8 @@
 # Javascript Bar
 
+**This section is here to document the inner workings of the client side debug bar.
+Nothing described below is needed to run the debug bar in a normal way.**
+
 The default client side implementation of the debug bar is made
 entirely in Javascript and is located in the *debugbar.js* file. 
 
@@ -165,3 +168,14 @@ and indicators of type `PhpDebugBar.DebugBar.Indicator`. These classes subclass
     // ----
 
     debugbar.addIndicator('phpdoc', new LinkIndicator({ href: 'http://doc.php.com', title: 'PHP doc' }));
+
+## OpenHandler
+
+An OpenHandler object can be provided using `setOpenHandler()`. The object is in charge
+of loading datasets. The only requirement is to provide a `show()` method which takes
+as only parameter a callback which expects an id and data parameter.
+
+The default implementation is `PhpDebugBar.OpenHandler` which must be use in conjonction
+with the server side `DebugBar\OpenHandler` (see previous section).
+
+    debugbar.setOpenHandler(new PhpDebugBar.OpenHandler({ url: "open.php" }));
\ No newline at end of file
diff --git a/docs/manifest.json b/docs/manifest.json
index eede10f..d3f2a34 100644
--- a/docs/manifest.json
+++ b/docs/manifest.json
@@ -9,6 +9,7 @@
         "base_collectors.md",
         "bridge_collectors.md",
         "storage.md",
+        "openhandler.md",
         "javascript_bar.md"
     ]
 }
diff --git a/docs/openhandler.md b/docs/openhandler.md
new file mode 100644
index 0000000..180ce91
--- /dev/null
+++ b/docs/openhandler.md
@@ -0,0 +1,23 @@
+# Open handler
+
+The debug bar can open previous sets of collected data which were stored using
+a storage handler (see previous section). To do so, it needs to be provided an
+url to an open handler.
+
+An open handler must respect a very simple protocol. The default implementation
+is `DebugBar\OpenHandler`.
+
+    $openHandler = new DebugBar\OpenHandler($debugbar);
+    $openHandler->handle();
+
+Calling `handle()` will use data from the `$_REQUEST` array and echo the output.
+The function also supports input from other source if you provide an array as
+first argument. It can also return the data instead of echoing (use false as
+second argument) and not send the content-type header (use false as third argument).
+
+One you have setup your open handler, tell the `JavascriptRenderer` its url.
+
+    $renderer->setOpenHandlerUrl('open.php');
+
+This adds a button in the top right corner of the debug bar which allows you
+to browse and open previous sets of collected data.
\ No newline at end of file