diff -r 871d7aea081a -r c5d236fe9668 src/HOL/Set.thy
--- a/src/HOL/Set.thy	Mon Mar 20 17:37:11 2006 +0100
+++ b/src/HOL/Set.thy	Mon Mar 20 17:38:22 2006 +0100
@@ -474,7 +474,7 @@
 
 subsubsection {* Subsets *}
 
-lemma subsetI [intro!]: "(!!x. x:A ==> x:B) ==> A \<subseteq> B"
+lemma subsetI [atp,intro!]: "(!!x. x:A ==> x:B) ==> A \<subseteq> B"
   by (simp add: subset_def)
 
 text {*