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diff --git a/src/main/java/org/apache/commons/math3/linear/NonSelfAdjointOperatorException.java b/src/main/java/org/apache/commons/math3/linear/NonSelfAdjointOperatorException.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.linear;
+
+import org.apache.commons.math3.exception.MathIllegalArgumentException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
+
+/**
+ * Exception to be thrown when a self-adjoint {@link RealLinearOperator} is expected. Since the
+ * coefficients of the matrix are not accessible, the most general definition is used to check that
+ * A is not self-adjoint, i.e. there exist x and y such as {@code | x' A y - y' A x | >= eps}, where
+ * {@code eps} is a user-specified tolerance, and {@code x'} denotes the transpose of {@code x}. In
+ * the terminology of this exception, {@code A} is the "offending" linear operator, {@code x} and
+ * {@code y} are the first and second "offending" vectors, respectively.
+ *
+ * @since 3.0
+ */
+public class NonSelfAdjointOperatorException extends MathIllegalArgumentException {
+    /** Serializable version Id. */
+    private static final long serialVersionUID = 1784999305030258247L;
+
+    /** Creates a new instance of this class. */
+    public NonSelfAdjointOperatorException() {
+        super(LocalizedFormats.NON_SELF_ADJOINT_OPERATOR);
+    }
+}