diff -r 6b1b6b7c1df0 -r 2d2110cda81e src/HOL/HOL.thy
--- a/src/HOL/HOL.thy	Thu Aug 26 19:02:21 1999 +0200
+++ b/src/HOL/HOL.thy	Thu Aug 26 19:04:19 1999 +0200
@@ -188,7 +188,8 @@
 use "HOL_lemmas.ML"	setup attrib_setup
 use "cladata.ML"	setup Classical.setup setup clasetup
 use "blastdata.ML"	setup Blast.setup
-use "simpdata.ML"	setup Simplifier.setup setup simpsetup setup Clasimp.setup
+use "simpdata.ML"	setup Simplifier.setup setup iff_attrib_setup
+			setup simpsetup setup Clasimp.setup
 
 
 end