diff --git a/ChangeLog b/ChangeLog
index b4de39f34b..7528357f3c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Dec 16 16:04:49 2015  Eric Wong  <e@80x24.org>
+
+	* NEWS: note IO#fadvise change [ruby-core:72168]
+
 Wed Dec 16 15:35:13 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm.c: fix mark miss for proc given as passed block.
diff --git a/NEWS b/NEWS
index 2661445e87..cb324080f9 100644
--- a/NEWS
+++ b/NEWS
@@ -97,6 +97,9 @@ with all sufficient information, see the ChangeLog file.
     this parameter is bitwise-ORed to oflags generated by normal mode argument.
     [Feature #11253]
 
+  * IO#fadvise no longer raises Errno::ENOSYS in cases where it was
+    detected at build time but not available at runtime.  [Feature #11806]
+
 * Kernel
 
   * Kernel#loop, when stopped by a StopIteration exception, returns