diff --git a/config/config.sample.php b/config/config.sample.php
index d0d735ed53..98da8aed35 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -97,7 +97,7 @@ $CONFIG = array(
  *
  * Available:
  * 	- sqlite (SQLite3 - Community Edition Only)
- * 	- mysql (MySQL)
+ * 	- mysql (MySQL/MariaDB)
  * 	- pgsql (PostgreSQL)
  * 	- oci (Oracle - Enterprise Edition Only)
  * 	- mssql (Microsoft SQL Server - Enterprise Edition Only)
@@ -657,6 +657,15 @@ $CONFIG = array(
  *  - OC\Preview\StarOffice
  *  - OC\Preview\SVG
  *  - OC\Preview\TIFF
+ *
+ * The following providers are not available in Microsoft Windows:
+ *
+ *  - OC\Preview\Movie
+ *  - OC\Preview\MSOfficeDoc
+ *  - OC\Preview\MSOffice2003
+ *  - OC\Preview\MSOffice2007
+ *  - OC\Preview\OpenDocument
+ *  - OC\Preview\StarOffice
  */
 'enabledPreviewProviders' => array(
 	'OC\Preview\Image',