diff --git a/tmux/.tmux.conf b/tmux/.tmux.conf
index e905e7f..aab9dca 100644
--- a/tmux/.tmux.conf
+++ b/tmux/.tmux.conf
@@ -43,6 +43,9 @@ if-shell '[ $(echo "$(tmux -V | cut -d" " -f2) >= 2.1" | bc) -eq 1 ]' \
 bind-key Tab last-window
 bind-key BTab previous-window
 
+# prefix-r to reload tmux config
+bind-key r source-file ~/.tmux.conf \; display-message "~/.tmux.conf reloaded"
+
 # Basic status bar colors
 set-option -g status-bg default
 set-option -g status-fg white
@@ -74,3 +77,25 @@ set-option -g display-panes-active-colour brightwhite
 # Clock mode
 set-option -g clock-mode-colour white
 set-option -g clock-mode-style 24
+
+# use F12 to move to inner/outer tmux sessions when nested
+# https://medium.freecodecamp.org/tmux-in-practice-local-and-nested-remote-tmux-sessions-4f7ba5db8795
+bind -T root F12 \
+	set prefix None \;\
+	set key-table off \;\
+    set window-status-format "#[fg=colour18,bg=brightblack] #I #[fg=white,bg=black] #W " \;\
+    set window-status-current-format "#[fg=colour18,bg=brightblac] #I #[fg=white,bg=blac] #W " \;\
+    set status-bg black \;\
+    set status-left "#[fg=white,bg=blac] #S #[fg=default,bg=default] " \;\
+    set status-right " #[fg=brightwhite,bg=black] %a, %d %b %H:%M #[fg=white,bg=blac] #(whoami)@#h " \;\
+    if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
+    display-message "ENTER inner tmux ..."
+bind -T off F12 \
+	set -u prefix \;\
+	set -u key-table \;\
+    set -u window-status-format \;\
+    set -u window-status-current-format \;\
+    set -u status-left \;\
+    set -u status-right \;\
+    set -u status-bg \;\
+    display-message "EXIT inner tmux ..."