diff --git a/ChangeLog b/ChangeLog
index 0eb89a7b0a..67c4275bb0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Aug 21 04:09:06 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* benchmark/bm_vm2_case.rb: add a new benchmark.
+	  YARV optimize case/when syntax.  If every conditions
+	  are literal (such as Symbol, Fixnum, String), dispatch
+	  calc order will be O(1).
+
 Tue Aug 21 04:08:07 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* test/ruby/test_enumerator.rb: fix last commit.
diff --git a/benchmark/bm_vm2_case.rb b/benchmark/bm_vm2_case.rb
new file mode 100644
index 0000000000..efbd366ebb
--- /dev/null
+++ b/benchmark/bm_vm2_case.rb
@@ -0,0 +1,14 @@
+i=0
+while i<6000000 # while loop 2
+  case :foo
+  when :bar
+    raise
+  when :baz
+    raise
+  when :boo
+    raise
+  when :foo
+    i+=1
+  end
+end
+