diff --git a/ChangeLog b/ChangeLog
index 260caed738..881fa361a1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Apr  2 21:17:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* NEWS: added reverse_lookup option.
+
 Fri Apr  2 15:26:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/rdoc/test_rdoc_ri_driver.rb (with_dummy_pager): don't grasp
diff --git a/NEWS b/NEWS
index 8242723b8e..38a57c4cf7 100644
--- a/NEWS
+++ b/NEWS
@@ -281,6 +281,8 @@ with all sufficient information, see the ChangeLog file.
     * BasicSocket#send, UDPSocket#send, Socket.getnameinfo, Socket#bind, and
       Socket#{connect,connect_nonblock} accepts an Addrinfo object as sockaddr.
     * BasicSocket#getsockopt accepts a Socket::Option object.
+    * Socket.getaddrinfo and IPSocket#{addr,peeraddr} accept an optional
+      argument to turn reverse lookup on/off.
 
     * constant names can be accepted as well as constant values.
       i.e. Socket.new(:PF_INET, :SOCK_STREAM, 0)