From 46e13b876cf8840ea1a030e9779944e677605ead Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 17 May 2016 13:26:24 +0000
Subject: add issue number for Array#sum incompatitbility description.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 NEWS | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 9e8d3ea574..21a8342443 100644
--- a/NEWS
+++ b/NEWS
@@ -78,8 +78,9 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 === Compatibility issues (excluding feature bug fixes)
 
-* Array#sum is implemented.  Ruby itself has no compatibility problem
-  because Ruby didn't have sum method for arrays before Ruby 2.4.
+* Array#sum is implemented.  [Feature #12217]
+  Ruby itself has no compatibility problem because Ruby didn't have sum method
+  for arrays before Ruby 2.4.
   However many third party gems, activesupport, facets, simple_stats, etc,
   defines sum method.  These implementations are mostly compatible but
   there are subtle differences.
-- 
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