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diff --git a/src/main/java/org/apache/commons/math/distribution/DiscreteDistribution.java b/src/main/java/org/apache/commons/math/distribution/DiscreteDistribution.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.distribution;
+
+
+/**
+ * Base interface for discrete distributions.
+ *
+ * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
+ */
+public interface DiscreteDistribution extends Distribution {
+    /**
+     * For a random variable X whose values are distributed according
+     * to this distribution, this method returns P(X = x). In other words, this
+     * method represents the probability mass function, or PMF for the distribution.
+     *
+     * @param x the value at which the probability mass function is evaluated.
+     * @return the value of the probability mass function at x
+     */
+    double probability(double x);
+}