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diff --git a/src/main/java/org/apache/commons/math3/linear/NonSquareMatrixException.java b/src/main/java/org/apache/commons/math3/linear/NonSquareMatrixException.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.DimensionMismatchException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
+
+/**
+ * Exception to be thrown when a square matrix is expected.
+ *
+ * @since 3.0
+ */
+public class NonSquareMatrixException extends DimensionMismatchException {
+    /** Serializable version Id. */
+    private static final long serialVersionUID = -660069396594485772L;
+
+    /**
+     * Construct an exception from the mismatched dimensions.
+     *
+     * @param wrong Row dimension.
+     * @param expected Column dimension.
+     */
+    public NonSquareMatrixException(int wrong, int expected) {
+        super(LocalizedFormats.NON_SQUARE_MATRIX, wrong, expected);
+    }
+}