diff --git a/common-tasks/full-screen-mode.md b/common-tasks/full-screen-mode.md
index 11566e9c..7a1cf752 100644
--- a/common-tasks/full-screen-mode.md
+++ b/common-tasks/full-screen-mode.md
@@ -32,7 +32,13 @@ Enabling full screen mode for select VMs
 
 If you want to enable full screen mode for select VMs, you can do that by creating the following entry in the /etc/qubes/guid.conf file in Dom0:
 
-**Note:** Regardless of the settings below, you can always put a window into fullscreen mode using the trusted window manager by right-clicking on a window's title bar and selecting "Fullscreen".
+**Note:** Regardless of the settings below, you can always put a window into
+fullscreen mode in Xfce4 using the trusted window manager by right-clicking on
+a window's title bar and selecting "Fullscreen". This functionality should still
+be considered safe, since a VM window still can't voluntarily enter fullscreen
+mode. The user must select this option from the trusted window manager in dom0.
+To exit fullscreen mode from here, press `alt` + `space` to bring up the title
+bar menu again, then select "Leave Fullscreen".
 
 **Note:** There should be only one `VM: {}` block in the file (or you will [get into problems](https://groups.google.com/d/msg/qubes-users/-Yf9yNvTsVI/xXsEm8y2lrYJ))
 
diff --git a/configuration/config-files.md b/configuration/config-files.md
index 388a1cb4..d83c2a19 100644
--- a/configuration/config-files.md
+++ b/configuration/config-files.md
@@ -79,9 +79,15 @@ VM: {
 Currently supported settings:
 
 -   `allow_fullscreen` - allow VM to request its windows to go 
-fullscreen (without any colorful frame). Regardless of this setting, 
-you can also set window fullscreen using trusted window manager 
-settings (right click on title bar).
+fullscreen (without any colorful frame).
+
+    **Note:** Regardless of this setting, you can always put a window into
+fullscreen mode in Xfce4 using the trusted window manager by right-clicking on
+a window's title bar and selecting "Fullscreen". This functionality should still
+be considered safe, since a VM window still can't voluntarily enter fullscreen
+mode. The user must select this option from the trusted window manager in dom0.
+To exit fullscreen mode from here, press `alt` + `space` to bring up the title
+bar menu again, then select "Leave Fullscreen".
 
 -   `allow_utf8_titles` - allow to use UTF-8 in window titles, 
 otherwise non-ASCII characters are replaced by underscore.