diff --git a/format.c b/format.c
index b5e51494..441e61be 100644
--- a/format.c
+++ b/format.c
@@ -554,6 +554,7 @@ format_window_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "pane_id", "%%%u", wp->id);
 	format_add(ft, "pane_active", "%d", wp == wp->window->active);
 	format_add(ft, "pane_dead", "%d", wp->fd == -1);
+	format_add(ft, "pane_input_off", "%d", !!(wp->flags & PANE_INPUTOFF));
 
 	if (window_pane_visible(wp)) {
 		format_add(ft, "pane_left", "%u", wp->xoff);
diff --git a/tmux.1 b/tmux.1
index 0c738f3e..9b853a1f 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3099,6 +3099,7 @@ The following variables are available, where appropriate:
 .It Li "pane_height" Ta "" Ta "Height of pane"
 .It Li "pane_id" Ta "#D" Ta "Unique pane ID"
 .It Li "pane_in_mode" Ta "" Ta "If pane is in a mode"
+.It Li "pane_input_off" Ta "" Ta "If input to pane is disabled"
 .It Li "pane_index" Ta "#P" Ta "Index of pane"
 .It Li "pane_left" Ta "" Ta "Left of pane"
 .It Li "pane_pid" Ta "" Ta "PID of first process in pane"