(Fwindow_start): Doc fix.

diff --git a/src/window.c b/src/window.c
index f9dd50e7f3187edadfe363ec10409b194386e54d..7d970d758edf54d3dde60db903c02a5881d72d6e 100644 (file)
--- a/src/window.c
+++ b/src/window.c
@@ -491,7 +491,8 @@ But that is hard to define.")
 }
 
 DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
-  "Return position at which display currently starts in WINDOW.")
+  "Return position at which display currently starts in WINDOW.\n\
+This is updated by redisplay or by calling `set-window-start'.")
   (window)
      Lisp_Object window;
 {