Update docs

README.md

@@ -1,8 +1,6 @@
 # celtic-magic-button
 
-A simple button for the Budgie panel to shut down your computer. The icon used is a [Celtic knot](https://en.wikipedia.org/wiki/Celtic_knot), a nod to the answer to the question, [How does Solus shut down so fast?](https://www.reddit.com/r/SolusProject/comments/6uup39/why_does_solus_shut_down_so_quickly/dlvkopm/)
-
-This is a one-click shutdown button. Use at your own risk!
+A simple button for the Budgie panel to shut down your computer. The icon used is a [Celtic knot](https://en.wikipedia.org/wiki/Celtic_knot), a nod to the official answer to the question, [How does Solus shut down so fast?](https://www.reddit.com/r/SolusProject/comments/6uup39/why_does_solus_shut_down_so_quickly/dlvkopm/)
 
 ## Installation
 
@@ -20,3 +18,13 @@ sudo ninja install
 * `budgie-desktop-devel`
 * `vala`
 
+## One-click shut down
+
+By default, pressing the button will yield a confirmation dialog. To bypass this dialog, issue the following command:
+
+```
+dconf write /org/gnome/gnome-session/logout-prompt true
+```
+
+Use this at your own risk! With this setting, pressing the button will result in your machine immediately shutting down.
+