diff --git a/ChangeLog b/ChangeLog
index e1ed8f46e0..0868a8e436 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jun 20 16:06:37 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* benchmark/gc/pentomino.rb: added.
+	  Simply load pentomino puzzle in the benchmark/ directory.
+
 Thu Jun 20 15:32:56 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* benchmark/gc/redblack.rb: import red black tree benchmark from
diff --git a/benchmark/gc/pentomino.rb b/benchmark/gc/pentomino.rb
new file mode 100644
index 0000000000..9d90bcb48f
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+++ b/benchmark/gc/pentomino.rb
@@ -0,0 +1 @@
+require_relative '../bm_app_pentomino.rb'