akr	2016-11-05 11:50:15 +0900 (Sat, 05 Nov 2016)

  New Revision: 56566

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56566

  Log:
    [DOC] add explanation for Array#sum

  Modified files:
    trunk/array.c
Index: array.c
===================================================================
--- array.c	(revision 56565)
+++ array.c	(revision 56566)
@@ -5717,7 +5717,8 @@ rb_ary_dig(int argc, VALUE *argv, VALUE https://github.com/ruby/ruby/blob/trunk/array.c#L5717
  *   ["a", "b", "c"].sum("")            #=> "abc"
  *   [[1], [[2]], [3]].sum([])          #=> [1, [2], 3]
  *
- * However, Array#join and Array#flatten is faster than Array#sum.
+ * However, Array#join and Array#flatten is faster than Array#sum for
+ * array of strings and array of arrays.
  *
  *   ["a", "b", "c"].join               #=> "abc"
  *   [[1], [[2]], [3]].flatten(1)       #=> [1, [2], 3]

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