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diff --git a/src/main/java/org/apache/commons/math/stat/clustering/Clusterable.java b/src/main/java/org/apache/commons/math/stat/clustering/Clusterable.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.math.stat.clustering;
+
+import java.util.Collection;
+
+/**
+ * Interface for points that can be clustered together.
+ * @param <T> the type of point that can be clustered
+ * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
+ * @since 2.0
+ */
+public interface Clusterable<T> {
+
+    /**
+     * Returns the distance from the given point.
+     *
+     * @param p the point to compute the distance from
+     * @return the distance from the given point
+     */
+    double distanceFrom(T p);
+
+    /**
+     * Returns the centroid of the given Collection of points.
+     *
+     * @param p the Collection of points to compute the centroid of
+     * @return the centroid of the given Collection of Points
+     */
+    T centroidOf(Collection<T> p);
+
+}