diff -r 636b62eb7e88 -r fce4a365f280 src/HOL/Library/Library.thy
--- a/src/HOL/Library/Library.thy	Mon May 27 22:30:07 2013 +0200
+++ b/src/HOL/Library/Library.thy	Mon May 27 22:32:28 2013 +0200
@@ -41,6 +41,7 @@
   Numeral_Type
   OptionalSugar
   Option_ord
+  Order_Union
   Parallel
   Permutation
   Permutations