diff --git a/README.md b/README.md
index 1f676b5..40ff3d0 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,15 @@ session-wrapper=/etc/lightdm/Xsession
 [XDMCPServer]
 
 [VNCServer]
-ROOT#
+```
+
+Don't allow X11 to switch Virtual Terminal, because you can switch the VT and so jump into a running session.
+Create a xorg config file into **/etc/X11/xorg.conf.d/00-blockvt.conf**
+
+```
+Section "ServerFlags"
+    Option "DontVTSwitch" "on"
+EndSection
 ```
 
 If you use a different dm, like GDM from gnome, disable this service