diff --git a/README.md b/README.md
index a67dfba..210668e 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,15 @@
 - https://github.com/mviereck/x11docker/wiki/How-to-access-X-over-TCP-IP-network
 - https://askubuntu.com/questions/203173/run-application-on-local-machine-and-show-gui-on-remote-display
 - https://askubuntu.com/questions/615139/how-to-make-x-org-listen-tcp-port-to-remote-connections
+
+
+How to determine display manager (thing that starts Xorg)
+- https://unix.stackexchange.com/questions/20370/is-there-a-simple-linux-command-that-will-tell-me-what-my-display-manager-is
+
+Enable TCP when using GDM3 as display manager
+- https://askubuntu.com/questions/672180/x-server-started-with-nolisten-tcp-in-spite-of-disallowtcp-false-in-etc-gdm
+
+
+
+Testing X server
+- https://wiki.archlinux.org/title/Xephyr