diff --git a/tmux.conf b/tmux.conf
index 790c987..54e5dff 100644
--- a/tmux.conf
+++ b/tmux.conf
@@ -23,5 +23,8 @@ set -q @plugin 'tmux-plugins/tmux-sidebar'
 set -g @resurrect-strategy-vim 'session'
 set -g @continuum-restore 'on'
 
+# Turn on focus events, used by (for example) Vim.
+set -g focus-events on
+
 # Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
 run -b '~/.tmux/plugins/tpm/tpm'