(Error Debugging): Refer forwards to eval-expression-debug-on-error.

doc/lispref/ChangeLog

+2008-12-12  Glenn Morris  <rgm@gnu.org>
+
+	* debugging.texi (Error Debugging): Refer forwards to
+	eval-expression-debug-on-error.
+
 2008-12-05  Eli Zaretskii  <eliz@gnu.org>
 
 	* strings.texi (String Basics): Only unibyte strings that

doc/lispref/debugging.texi

@@ -89,7 +89,8 @@ This variable determines whether the debugger is called when an error is
 signaled and not handled.  If @code{debug-on-error} is @code{t}, all
 kinds of errors call the debugger (except those listed in
 @code{debug-ignored-errors}).  If it is @code{nil}, none call the
-debugger.
+debugger.  (Note that @code{eval-expression-debug-on-error} affects the
+setting of this variable in some cases; see below.)
 
 The value can also be a list of error conditions that should call the
 debugger.  For example, if you set it to the list