diff --git a/ChangeLog b/ChangeLog
index 0f8b00207d..b01e63bf7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Feb  5 03:34:02 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/fileutils/fileasserts.rb (Test::Unit::Assertions#assert_block):
+	  show the given message.
+
 Sat Feb  5 02:09:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (lex_getline, parser_set_encode): set encoding of lines
diff --git a/test/fileutils/fileasserts.rb b/test/fileutils/fileasserts.rb
index bad87e9ce0..579fefd15e 100644
--- a/test/fileutils/fileasserts.rb
+++ b/test/fileutils/fileasserts.rb
@@ -8,6 +8,10 @@ module Test
         yield
       end
 
+      def assert_block msg = nil
+        assert yield, msg
+      end
+
       def assert_same_file(from, to)
         _wrap_assertion {
           assert_block("file #{from} != #{to}") {