--- a/doc-src/TutorialI/Misc/trace_simp.thy	Fri Sep 01 18:29:52 2000 +0200
+++ b/doc-src/TutorialI/Misc/trace_simp.thy	Fri Sep 01 19:09:44 2000 +0200
@@ -4,7 +4,7 @@
 
 text{*
 Using the simplifier effectively may take a bit of experimentation.  Set the
-\ttindexbold{trace_simp} \rmindex{flag} to get a better idea of what is going
+\isaindexbold{trace_simp} \rmindex{flag} to get a better idea of what is going
 on:
 *}
 ML "set trace_simp";