diff --git a/.tmux.conf b/.tmux.conf
index 83c2293..162be7c 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -81,3 +81,27 @@ set-window-option -g window-status-format " #I:#W#{?window_last_flag,-,} "
 set-window-option -g window-status-separator ""
 set-option -g pane-active-border-style "fg=$airline_blue"
 set-option -g pane-border-style "fg=$airline_grey"
+
+# Nesting tmux sessions, see
+# https://github.com/samoshkin/tmux-config/blob/master/tmux/tmux.conf
+# TODO: window-status-style doesn't change anything...
+bind -T root F12  \
+    set prefix None \;\
+    set key-table off \;\
+    set status-style "bg=$airline_grey,fg=$airline_red" \;\
+    set status-left-style "bg=$airline_grey,fg=$airline_red,bold,noitalics,nounderscore" \;\
+    set status-right-style "bg=$airline_red,fg=$airline_grey,bold,noitalics,nounderscore" \;\
+    set window-status-current-style "bg=$airline_red,fg=$airline_grey" \;\
+    set window-status-style "bg=$airline_grey,fg=$airline_red,nobold,noitalics,nounderscore" \;\
+    if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
+    refresh-client -S
+
+bind -T off F12 \
+  set -u prefix \;\
+  set -u key-table \;\
+  set -u status-style \;\
+  set -u status-left-style \;\
+  set -u status-right-style \;\
+  set -u window-status-current-style \;\
+  set -u window-status-style \;\
+  refresh-client -S