From 350a74005804b2e99302d1647bb9255cfc06ab62 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 14 Apr 2016 00:00:32 +0000
Subject: [PATCH] [DOC]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54568 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 array.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/array.c b/array.c
index 85e3177b21..f52b967a9c 100644
--- a/array.c
+++ b/array.c
@@ -5659,9 +5659,10 @@ rb_ary_dig(int argc, VALUE *argv, VALUE self)
  *
  * If <i>ary</i> is empty, it returns 0.
  *
- * [].sum                       #=> 0
- * [1, 2, 3].sum                #=> 6
- * [3, 5.5].sum                 #=> 8.5
+ *   [].sum                     #=> 0
+ *   [1, 2, 3].sum              #=> 6
+ *   [3, 5.5].sum               #=> 8.5
+ *   [Object.new].sum           #=> TypeError
  *
  * This method may not respect method redefinition of "+" methods
  * such as Fixnum#+.