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diff --git a/src/de/lmu/ifi/dbs/elki/algorithm/clustering/ClusteringAlgorithm.java b/src/de/lmu/ifi/dbs/elki/algorithm/clustering/ClusteringAlgorithm.java
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+++ b/src/de/lmu/ifi/dbs/elki/algorithm/clustering/ClusteringAlgorithm.java
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+package de.lmu.ifi.dbs.elki.algorithm.clustering;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+Ludwig-Maximilians-Universität München
+Lehr- und Forschungseinheit für Datenbanksysteme
+ELKI Development Team
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import de.lmu.ifi.dbs.elki.algorithm.Algorithm;
+import de.lmu.ifi.dbs.elki.data.Clustering;
+import de.lmu.ifi.dbs.elki.data.model.Model;
+import de.lmu.ifi.dbs.elki.database.Database;
+
+/**
+ * Interface for Algorithms that are capable to provide a {@link Clustering
+ * Clustering} as Result. in general, clustering algorithms are supposed to
+ * implement the {@link de.lmu.ifi.dbs.elki.algorithm.Algorithm}-Interface. The
+ * more specialized interface {@link ClusteringAlgorithm} requires an
+ * implementing algorithm to provide a special result class suitable as a
+ * partitioning of the database. More relaxed clustering algorithms are allowed
+ * to provide a result that is a fuzzy clustering, does not partition the
+ * database complete or is in any other sense a relaxed clustering result.
+ * 
+ * @author Arthur Zimek
+ * 
+ * @apiviz.uses Clustering
+ * @apiviz.uses Model
+ * 
+ * @param <C> Clustering type
+ */
+public interface ClusteringAlgorithm<C extends Clustering<? extends Model>> extends Algorithm {
+  @Override
+  C run(Database database) throws IllegalStateException;
+}
+\ No newline at end of file