diff --git a/ChangeLog b/ChangeLog
index 17d2aedbdc..8a1d9c73c9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,14 @@
+Sun Dec 27 11:50:53 2015  Kuniaki IGARASHI  <igaiga@gmail.com>
+
+	* test/ruby/test_string.rb (test_rstrip, test_lstrip): Add tests
+	  for String#lstrip and rstrip.  The test cases are used from
+	  string.c ruby-doc comments.  [Fix GH-1174]
+
 Sun Dec 27 11:47:46 2015  Kuniaki IGARASHI  <igaiga@gmail.com>
 
-	* test/ruby/test_string.rb (test_insert): The test cases are
-	  written in string.c comments as a reference.  [Fix GH-1173]
+	* test/ruby/test_string.rb (test_insert): Add test for
+	  String#test_insert.  The test cases are written in string.c
+	  comments as a reference.  [Fix GH-1173]
 
 Sun Dec 27 11:03:33 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index f907a28f99..96137e3de9 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -2137,10 +2137,16 @@ class TestString < Test::Unit::TestCase
   end
 
   def test_rstrip
+    assert_equal("  hello", "  hello  ".rstrip)
     assert_equal("\u3042", "\u3042   ".rstrip)
     assert_raise(Encoding::CompatibilityError) { "\u3042".encode("ISO-2022-JP").rstrip }
   end
 
+  def test_lstrip
+    assert_equal("hello  ", "  hello  ".lstrip)
+    assert_equal("\u3042", "   \u3042".lstrip)
+  end
+
 =begin
   def test_symbol_table_overflow
     assert_in_out_err([], <<-INPUT, [], /symbol table overflow \(symbol [a-z]{8}\) \(RuntimeError\)/)