Document `buffer-chars-modified-tick'

diff --git a/etc/NEWS b/etc/NEWS
index aefb11ccb2d71173a07f877a07f4a0bb6753bbfb..28e5fb0d93f0c50a998c013d37f94d17df663405 100644 (file)
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -4082,6 +4082,13 @@ position or for a given window pixel coordinate.
 
 ** Text modification:
 
++++
+*** The new function `buffer-chars-modified-tick' returns a buffer's
+tick counter for changes to characters.  Each time text in that buffer
+is inserted or deleted, the character-change counter is updated to the
+tick counter (`buffer-modified-tick').  Text property changes leave it
+unchanged.
+
 +++
 *** The new function `insert-for-yank' normally works like `insert', but
 removes the text properties in the `yank-excluded-properties' list