diff -r 9e1136e8bb1f -r 7695e4de4d86 src/HOL/Tools/nat_numeral_simprocs.ML
--- a/src/HOL/Tools/nat_numeral_simprocs.ML	Thu Dec 02 15:37:32 2010 +0100
+++ b/src/HOL/Tools/nat_numeral_simprocs.ML	Thu Dec 02 16:04:22 2010 +0100
@@ -446,7 +446,7 @@
 (*examples:
 print_depth 22;
 set timing;
-set trace_simp;
+set simp_trace;
 fun test s = (Goal s; by (Simp_tac 1));
 
 (*cancel_numerals*)