akr	2016-05-17 22:26:24 +0900 (Tue, 17 May 2016)

  New Revision: 55031

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55031

  Log:
    add issue number for Array#sum incompatitbility description.

  Modified files:
    trunk/NEWS
Index: NEWS
===================================================================
--- NEWS	(revision 55030)
+++ NEWS	(revision 55031)
@@ -78,8 +78,9 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L78
 
 === 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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