*** empty log message ***

1 files changed, 10 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index dcf8b55e99..72d52668d5 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -29,6 +29,16 @@ support 64-bit executables.  See etc/MACHINES for instructions.
 
 * Changes in Emacs 21.1
 
+** The new variable `auto-mode-interpreter-regexp' contains a regular
+expression matching interpreters, for file mode determination.
+
+This regular expression is matched against the first line of a file to
+determine the file's mode in `set-auto-mode' when Emacs can't deduce a
+mode from the file's name.  If it matches, the file is assumed to be
+interpreted by the interpreter matched by the second group of the
+regular expression.  The mode is then determined as the mode
+associated with that interpreter in `interpreter-mode-alist'.
+
 ** C-down-mouse-3 is bound differently.  Now if the menu bar is not
 displayed it pops up a menu containing the items which would be on the
 menu bar.  If the menu bar is displayed, it pops up the major mode