diff --git a/src/java/com/threerings/parlor/rating/util/Percentiler.java b/src/java/com/threerings/parlor/rating/util/Percentiler.java
index b70208d3..2058142d 100644
--- a/src/java/com/threerings/parlor/rating/util/Percentiler.java
+++ b/src/java/com/threerings/parlor/rating/util/Percentiler.java
@@ -1,5 +1,23 @@
 //
-// $Id: Percentiler.java 25062 2006-06-13 22:52:01Z ray $
+// $Id: TestConfig.java 4193 2006-06-13 23:06:48Z ray $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
 package com.threerings.parlor.rating.util;
 
diff --git a/tests/src/java/com/threerings/parlor/rating/util/PercentilerTest.java b/tests/src/java/com/threerings/parlor/rating/util/PercentilerTest.java
new file mode 100644
index 00000000..daa2c1da
--- /dev/null
+++ b/tests/src/java/com/threerings/parlor/rating/util/PercentilerTest.java
@@ -0,0 +1,70 @@
+//
+// $Id: TestConfig.java 4193 2006-06-13 23:06:48Z ray $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.parlor.rating.util;
+
+import java.util.Random;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+
+/**
+ * Tests the {@link Percentiler} class.
+ */
+public class PercentilerTest extends TestCase
+{
+    public PercentilerTest ()
+    {
+        super(PercentilerTest.class.getName());
+    }
+
+    public void runTest ()
+    {
+        // create a percentiler
+        Percentiler tiler = new Percentiler();
+        Random rando = new Random();
+
+        // add some random values
+        for (int ii = 0; ii < 500; ii++) {
+            tiler.recordValue((float)rando.nextGaussian() + 5.0f);
+        }
+        tiler.recomputePercentiles();
+
+        // now dump the tiler
+        tiler.dump(System.out);
+
+        // serialize and unserialize
+        Percentiler t2 = new Percentiler(tiler.toBytes());
+        // and dump again
+        tiler.dump(System.out);
+    }
+
+    public static Test suite ()
+    {
+        return new PercentilerTest();
+    }
+
+    public static void main (String[] args)
+    {
+        PercentilerTest test = new PercentilerTest();
+        test.runTest();
+    }
+}