usa	2014-12-16 16:48:22 +0900 (Tue, 16 Dec 2014)

  New Revision: 48866

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=48866

  Log:
    * NEWS: mention about IO#fsync (and IO#flush).  adviced by kosaki.

  Modified files:
    trunk/NEWS
Index: NEWS
===================================================================
--- NEWS	(revision 48865)
+++ NEWS	(revision 48866)
@@ -107,9 +107,10 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L107
 
 * IO
   * incompatible changes:
-    * When flushing file IO, you cannot assume that the metadata of the file
-      is updated immediately.  On some platforms (especially Windows), it is
-      delayed until the filesystem load is decreased.
+    * When flushing file IO with IO#flush, you cannot assume that the metadata
+      of the file is updated immediately.  On some platforms (especially
+      Windows), it is delayed until the filesystem load is decreased.
+      Use IO#fsync if you want to guarantee updaiting metadata.
 
 * Math
   * incompatible changes:

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