write-region change

diff --git a/lispref/files.texi b/lispref/files.texi
index cf6fb8f57398922369249de0cb8cb53974f9b0d3..e27ab8f81d2c1f1bd9e48f0a83390a9b3b987c67 100644 (file)
--- a/lispref/files.texi
+++ b/lispref/files.texi
@@ -550,7 +550,9 @@ that string, rather than text from the buffer.  @var{end} is ignored in
 this case.
 
 If @var{append} is non-@code{nil}, then the specified text is appended
-to the existing file contents (if any).
+to the existing file contents (if any).  Starting in Emacs 21, if
+@var{append} is an integer, then @code{write-region} seeks to that byte
+offset from the start of the file and writes the data from there.
 
 If @var{mustbenew} is non-@code{nil}, then @code{write-region} asks
 for confirmation if @var{filename} names an existing file.