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diff --git a/src/main/java/org/apache/commons/math3/optimization/fitting/WeightedObservedPoint.java b/src/main/java/org/apache/commons/math3/optimization/fitting/WeightedObservedPoint.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.math3.optimization.fitting;
+
+import java.io.Serializable;
+
+/** This class is a simple container for weighted observed point in
+ * {@link CurveFitter curve fitting}.
+ * <p>Instances of this class are guaranteed to be immutable.</p>
+ * @deprecated As of 3.1 (to be removed in 4.0).
+ * @since 2.0
+ */
+@Deprecated
+public class WeightedObservedPoint implements Serializable {
+
+    /** Serializable version id. */
+    private static final long serialVersionUID = 5306874947404636157L;
+
+    /** Weight of the measurement in the fitting process. */
+    private final double weight;
+
+    /** Abscissa of the point. */
+    private final double x;
+
+    /** Observed value of the function at x. */
+    private final double y;
+
+    /** Simple constructor.
+     * @param weight weight of the measurement in the fitting process
+     * @param x abscissa of the measurement
+     * @param y ordinate of the measurement
+     */
+    public WeightedObservedPoint(final double weight, final double x, final double y) {
+        this.weight = weight;
+        this.x      = x;
+        this.y      = y;
+    }
+
+    /** Get the weight of the measurement in the fitting process.
+     * @return weight of the measurement in the fitting process
+     */
+    public double getWeight() {
+        return weight;
+    }
+
+    /** Get the abscissa of the point.
+     * @return abscissa of the point
+     */
+    public double getX() {
+        return x;
+    }
+
+    /** Get the observed value of the function at x.
+     * @return observed value of the function at x
+     */
+    public double getY() {
+        return y;
+    }
+
+}
+