1 files changed, 4 insertions, 0 deletions

diff --git a/src/buffer.h b/src/buffer.h
index 280d4e9098e..37a50d276f1 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -348,6 +348,10 @@ struct buffer
      of windows.  Nil means don't display that line.  */
   Lisp_Object header_line_format_;
 
+  /* Analogous to mode_line_format for the line displayed at the top
+     of windows.  Nil means don't display that line.  */
+  Lisp_Object tab_line_format_;
+
   /* Keys that are bound local to this buffer.  */
   Lisp_Object keymap_;