(Horizontal Scrolling): Add an index entry for automatic-hscrolling.

diff --git a/lispref/windows.texi b/lispref/windows.texi
index f7253f05be9b10173b8bd14124b382daf2f98e8c..24855db2e60f011b1c9c5923fcbe06a6de3279c3 100644 (file)
--- a/lispref/windows.texi
+++ b/lispref/windows.texi
@@ -1542,6 +1542,7 @@ reduce the net horizontal scroll to zero.  There is no limit to how far
 left you can scroll, but eventually all the text will disappear off the
 left edge.
 
+@vindex automatic-hscrolling
   In Emacs 21, redisplay automatically alters the horizontal scrolling
 of a window as necessary to ensure that point is always visible, if
 @code{automatic-hscrolling} is set.  However, you can still set the