diff --git a/README.md b/README.md
index c89854f..579fec3 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,9 @@
 FlyPie
 ======
 
-Lightweight [Flysystem](http://flysystem.thephpleague.com/) wrapper/configuration plugin for CakePHP v3.x
+Lightweight [Flysystem](http://flysystem.thephpleague.com/) wrapper/configuration plugin for CakePHP.
+
+See below for CakePHP core version compatibility matrix.
 
 ## Installation ##
 
@@ -21,7 +23,7 @@ Plugin::load('WyriHaximus/FlyPie', ['bootstrap' => true]);
 
 ## Configuration ##
 
-Example configuration (for in `config/app.php`):
+Example configuration (for in `config/app_local.php`):
 
 ```php
 /**
@@ -43,13 +45,21 @@ Example configuration (for in `config/app.php`):
 
 At first it's namespaced within `WyriHaximus.FlyPie` to make sure it doesn't interfere with any other plugins. Secondly it's an associative array where every key is the alias for a specific plugin configuration. That is `s3_thumbnails` in our example. So when you need that filesystem somewhere in your project you can call `$this->filesystem('s3_thumbnails');` on the trait. 
 
+To enable the filesystem panel in DebugKit add the configuration as shown below:
+
+```php
+'DebugKit' => [
+    'panels' => ['WyriHaximus/FlyPie.Filesystem'],
+],
+```
+
 ### Configuration keys ###
 
 * `adapter` - adapter name or full qualified class name to use for this filesystem
 * `vars` - array containing the required settings for FlyPie to build an adapter for you. That is passed directly into `newInstanceArgs` upon adapter creation. (This is required in case you don't use a factory or provide the client.)
 * `client` - a prebuild client
 * `factory` - a callback, array (class instance, methodname), string (static class method or function name or event name) that can be utilized as a factory to build the adapter
-* `url` - [Data Source Name](https://book.cakephp.org/3.0/en/appendices/glossary.html#term-dsn). A connection string format that is formed like a URI. See below for examples.
+* `url` - [Data Source Name](https://book.cakephp.org/4/en/appendices/glossary.html#term-dsn). A connection string format that is formed like a URI. See below for examples.
 
 Check out [`config/config.sample.php`](config/config.sample.php) for more details.
 
@@ -76,6 +86,13 @@ per case basis as extra composer packages. For all supported adapters see:
 | -------------- | --------------------------------------------------------------------------- |
 | AwsS3v3Adapter | `s3://key:secret@bucket/path?region={{region}}&version={{latest\|version}}` |
 
+## CakePHP version compatibility matrix ##
+
+| FlyPie | CakePHP core | PHP min |
+| ------ | ------------ | ------- |
+| 1.x    | 3.x          | PHP 5.4 |
+| 2.x    | 4.x          | PHP 7.2 |
+
 ## License ##
 
 Copyright 2017 [Cees-Jan Kiewiet](http://wyrihaximus.net/)
diff --git a/src/Panel/FilesystemPanel.php b/src/Panel/FilesystemPanel.php
index c7b8b86..d8fd975 100644
--- a/src/Panel/FilesystemPanel.php
+++ b/src/Panel/FilesystemPanel.php
@@ -23,11 +23,12 @@ public function data()
     {
         $data = [
             'filesystems' => array_keys((array)Configure::read(self::CONFIGURE_KEY)),
-            'instances' => [],
+            'classes' => [],
         ];
 
         foreach ($data['filesystems'] as $filesystem) {
-            $data['instances'][$filesystem] = FilesystemRegistry::retrieve($filesystem);
+            $instance = FilesystemRegistry::retrieve($filesystem);
+            $data['classes'][$filesystem] = get_class($instance->getAdapter());
         }
 
         return $data;
diff --git a/src/Template/Element/filesystem_panel.ctp b/templates/element/filesystem_panel.php
similarity index 78%
rename from src/Template/Element/filesystem_panel.ctp
rename to templates/element/filesystem_panel.php
index 3cf7d7a..987c3b8 100644
--- a/src/Template/Element/filesystem_panel.ctp
+++ b/templates/element/filesystem_panel.php
@@ -1,17 +1,17 @@
 <?php
 
-use \WyriHaximus\FlyPie\Panel\FilesystemPanel;
+use WyriHaximus\FlyPie\Panel\FilesystemPanel;
 
 ?>
 
-<?php if (!empty($filesystems)): ?>
+<?php if (!empty($filesystems)) : ?>
     <h4>Configured filesystems</h4>
     <p class="warning">The following list used <strong><?= FilesystemPanel::CONFIGURE_KEY ?></strong> as filesystem list:</p>
     <ul class="neat-array depth-0">
-        <?php foreach ($filesystems as $filesystem): ?>
+        <?php foreach ($filesystems as $filesystem) : ?>
             <li class="expandable collapsed filesystemtree" data-alias="<?= $filesystem; ?>">
                 <strong><?= h($filesystem) ?></strong>
-                (<?= h(get_class($instances[$filesystem]->getAdapter())) ?>)
+                (<?= h($classes[$filesystem]) ?>)
                 <ul class="neat-array depth-1 loading" style="display: none;">
                     <li>Loading...</li>
                 </ul>
@@ -25,6 +25,6 @@
         });
     </script>
     <hr />
-<?php else: ?>
+<?php else : ?>
     <div class="warning"><?= __d('fly_pie', 'No configured filesystem found') ?></div>
 <?php endif ?>