Explain die uses $*ERR.

See issue #1722.

Author: fluca1978

doc/Language/exceptions.pod6

@@ -17,13 +17,16 @@ backtrace printer.
 
 =head1 Ad hoc exceptions
 
-Ad hoc exceptions can be used by calling C<die> with
-a description of the error.
+Ad hoc exceptions can be used by calling L<die|/routine/die> with
+a description of the error:
 
     die "oops, something went wrong";
 
     # RESULT: «oops, something went wrong in block <unit> at my-script.p6:1␤»
 
+
+It is worth noting that C<die> prints the error message to the standard error C<$*ERR>.
+
 =head1 Typed exceptions
 
 Typed exceptions provide more information about the error stored