diff -r 1a9decb8bfbc -r ae9e6218443d src/HOL/Library/Code_Cardinality.thy
--- a/src/HOL/Library/Code_Cardinality.thy	Mon Apr 10 23:21:47 2023 +0200
+++ b/src/HOL/Library/Code_Cardinality.thy	Tue Apr 11 11:59:02 2023 +0000
@@ -1,4 +1,4 @@
-subsection \<open>Code setup for sets with cardinality type information\<close>
+section \<open>Code setup for sets with cardinality type information\<close>
 
 theory Code_Cardinality imports Cardinality begin