1 files changed, 1 insertions, 0 deletions
diff --git a/tmux.1 b/tmux.1
index da97dd72..923f17b9 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3601,6 +3601,7 @@ The following variables are available, where appropriate:
 .It Li "pane_left" Ta "" Ta "Left of pane"
 .It Li "pane_mode" Ta "" Ta "Name of pane mode, if any."
 .It Li "pane_pid" Ta "" Ta "PID of first process in pane"
+.It Li "pane_pipe" Ta "" Ta "1 if pane is being piped"
 .It Li "pane_right" Ta "" Ta "Right of pane"
 .It Li "pane_search_string" Ta "" Ta "Last search string in copy mode"
 .It Li "pane_start_command" Ta "" Ta "Command pane started with"