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diff --git a/src/main/java/org/apache/commons/math/distribution/ContinuousDistribution.java b/src/main/java/org/apache/commons/math/distribution/ContinuousDistribution.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;
+
+import org.apache.commons.math.MathException;
+
+/**
+ * <p>Base interface for continuous distributions.</p>
+ *
+ * <p>Note: this interface will be extended in version 3.0 to include
+ * <br/><code>public double density(double x)</code><br/>
+ * that is, from version 3.0 forward, continuous distributions <strong>must</strong>
+ * include implementations of probability density functions. As of version
+ * 2.1, all continuous distribution implementations included in commons-math
+ * provide implementations of this method.</p>
+ *
+ * @version $Revision: 924362 $ $Date: 2010-03-17 17:45:31 +0100 (mer. 17 mars 2010) $
+ */
+public interface ContinuousDistribution extends Distribution {
+
+    /**
+     * For this distribution, X, this method returns x such that P(X &lt; x) = p.
+     * @param p the cumulative probability.
+     * @return x.
+     * @throws MathException if the inverse cumulative probability can not be
+     *            computed due to convergence or other numerical errors.
+     */
+    double inverseCumulativeProbability(double p) throws MathException;
+}