diff --git a/lib/test/unit/doc_test.rb b/lib/test/unit/doc_test.rb
index <HASH>..<HASH> 100644
--- a/lib/test/unit/doc_test.rb
+++ b/lib/test/unit/doc_test.rb
@@ -1,3 +1,4 @@
+# encoding: UTF-8
 require File.expand_path(File.join(File.dirname(__FILE__), '..', 'test_helper'))
 
 class TestDoc < Test::Unit::TestCase
added utf-8 support for doc_test for < ruby <I>