diff --git a/desktop/.config/river/init b/desktop/.config/river/init
index debf7fc..6f93d12 100755
--- a/desktop/.config/river/init
+++ b/desktop/.config/river/init
@@ -161,6 +161,13 @@ riverctl map interact_float None J send-layout-cmd $layout "main-count +1"
 riverctl map interact_float None K send-layout-cmd $layout "main-count -1"
 ### End resize and moving mode
 
+## Passthrough mode which disables all other mappings and only retains the single
+#  mapping to return to normal mode. Useful for some full screen applications
+#  which should capture everything, or for testing nested wayland compositors.
+riverctl declare-mode passthrough
+riverctl map normal $mod F11 enter-mode passthrough
+riverctl map passthrough $mod F11 enter-mode normal
+
 # focus the next/previous output
 riverctl map normal $mod Period focus-output next
 riverctl map normal $mod Comma focus-output previous