(Error Debugging): Document stack-trace-on-error.

diff --git a/lispref/debugging.texi b/lispref/debugging.texi
index 07dfe18f283835a807bc6c88763393ed1f4cc7c6..5886138eb55b2270e1c726a40b90b3bcfe0dca47 100644 (file)
--- a/lispref/debugging.texi
+++ b/lispref/debugging.texi
@@ -166,6 +166,20 @@ this:
           (lambda () (setq debug-on-error t)))
 @end example
 
+When the debugger is entered, it shows a backtrace (@pxref{Using
+Debugger}).  If you like to see the backtrace when an error happens,
+but you do not want to enter the debugger, you can set the variable
+@code{stack-trace-on-error} to non-@code{nil}.
+
+@defopt stack-trace-on-error
+This variable determines whether a backtrace buffer is shown when an
+error is signalled and not handled.  If @code{stack-trace-on-error} is
+@code{t}, all kinds of errors display a backtrace; if it is
+@code{nil}, none do.  If the value is a list, an error only means to
+display a backtrace if one of its condition symbols appears in the
+list.
+@end defopt
+
 @node Infinite Loops
 @subsection Debugging Infinite Loops
 @cindex infinite loops