diff -r f5bceeec9d91 -r 704713ca07ea src/HOL/MicroJava/BV/Opt.thy
--- a/src/HOL/MicroJava/BV/Opt.thy	Wed Feb 20 17:30:46 2002 +0100
+++ b/src/HOL/MicroJava/BV/Opt.thy	Thu Feb 21 09:54:08 2002 +0100
@@ -6,7 +6,7 @@
 More about options
 *)
 
-header "More about Options"
+header {* \isaheader{More about Options} *}
 
 theory Opt = Err: