1 files changed, 5 insertions, 2 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 57137b2a067..548d7b1c65c 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5598,8 +5598,11 @@ the mode line appears at the bottom.  */);
                      &BVAR (current_buffer, header_line_format),
                      Qnil,
                      doc: /* Analogous to `mode-line-format', but controls the header line.
-The header line appears, optionally, at the top of a window;
-the mode line appears at the bottom.  */);
+The header line appears, optionally, at the top of a window; the mode
+line appears at the bottom.
+
+Also see `header-line-indent-mode' if `display-line-number-mode' is
+used.  */);
 
   DEFVAR_PER_BUFFER ("mode-line-format", &BVAR (current_buffer, mode_line_format),
                      Qnil,