1 files changed, 2 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 4effac06ee4..f343c594f05 100644
--- a/src/process.c
+++ b/src/process.c
@@ -1752,7 +1752,8 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
       /* If frame size has changed or the window is newly mapped,
          redisplay now, before we start to wait.  There is a race
          condition here; if a SIGIO arrives between now and the select
-         and indicates that a frame is trashed, we lose.  */
+         and indicates that a frame is trashed, the select may block
+         displaying a trashed screen.  */
       if (frame_garbaged)
         redisplay_preserve_echo_area ();