diff --git a/docs/Installation.md b/docs/Installation.md
index 58d0175..aa64dd2 100644
--- a/docs/Installation.md
+++ b/docs/Installation.md
@@ -3,7 +3,7 @@ Everything you need is a web-server with PHP 5.5 or later and a MySQL-Database.
 
 The following PHP extensions must be activated:
 
-	exif, gd, json, mbstring, mysqli, zip
+	session, exif, mbstring, gd, mysqli, json, zip
 	
 To use Lychee without restrictions, we recommend to increase the values of the following properties in `php.ini`: