diff --git a/data/lightdm.conf b/data/lightdm.conf
index 60e3e8b4..8d9c0514 100644
--- a/data/lightdm.conf
+++ b/data/lightdm.conf
@@ -56,6 +56,7 @@
 # xserver-share = True if the X server is shared for both greeter and session
 # xserver-hostname = Hostname of X server (only for type=xremote)
 # xserver-display-number = Display number of X server (only for type=xremote)
+# desired-display-number = The display number you wish to have this seat have, if it is already used the next available will be used
 # xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
 # xdmcp-port = XDMCP UDP/IP port to communicate on
 # xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)