diff --git a/ChangeLog b/ChangeLog
index f09518718b..ea8e3e3e3c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 19 05:36:16 2014  Eric Wong  <e@80x24.org>
+
+	* NEWS: note --with-jemalloc option [ci skip]
+
 Thu Sep 18 16:26:27 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/rubygems/test_gem_commands_setup_command.rb: @ui uses StringIO
diff --git a/NEWS b/NEWS
index 6abfa3fc50..39c24733b8 100644
--- a/NEWS
+++ b/NEWS
@@ -253,3 +253,9 @@ with all sufficient information, see the ChangeLog file.
   * RUBY_INTERNAL_EVENT_GC_ENTER
   * RUBY_INTERNAL_EVENT_GC_EXIT
     r47528
+
+=== Build system updates
+
+* jemalloc is optionally supported via `./configure --with-jemalloc`
+  jemalloc may be suitable when system malloc is slow or prone
+  to fragmentation.  [Feature #9113]