diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index a2ce620354..97ffd11f2d 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -243,7 +243,7 @@ module ActiveRecord
     #   end
     #   coder = {}
     #   Post.new.encode_with(coder)
-    #   coder # => { 'id' => nil, ... }
+    #   coder # => {"attributes" => {"id" => nil, ... }}
     def encode_with(coder)
       coder['attributes'] = attributes
     end