diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index b4997476a..98ee6128b 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -676,6 +676,16 @@ The app store is disabled by default for ownCloud Enterprise Edition
 
 The URL of the appstore to use.
 
+::
+
+	'appstore.experimental.enabled' => false,
+
+Whether to show experimental apps in the appstore interface
+
+Experimental apps are not checked for security issues and are new or known
+to be unstable and under heavy development. Installing these can cause data
+loss or security breaches.
+
 ::
 
 	'apps_paths' => array(
@@ -728,14 +738,14 @@ Valid values are ``true``, to enable previews, or
 
 ::
 
-	'preview_max_x' => null,
+	'preview_max_x' => 2048,
 
 The maximum width, in pixels, of a preview. A value of ``null`` means there
 is no limit.
 
 ::
 
-	'preview_max_y' => null,
+	'preview_max_y' => 2048,
 
 The maximum height, in pixels, of a preview. A value of ``null`` means there
 is no limit.