diff --git a/ChangeLog b/ChangeLog
index 463e90e439..d1f14fb08d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,9 @@
-Sat Feb 24 18:43:30 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sat Feb 24 18:44:30 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* intern.h (rb_thread_blocking_region): add prototype.
 
+	* file.c (rb_thread_flock, rb_file_flock): use UBF feature.
+
 	* process.c (rb_waitpid_blocking, rb_waitpid): use UBF feature.
 
 	* thread.c (rb_thread_debug): added runtime debugging flag.