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diff --git a/examples/h5_rdwt.c b/examples/h5_rdwt.c
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://www.hdfgroup.org/licenses.               *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ *  This example illustrates how to write and read data in an existing
+ *  dataset.  It is used in the HDF5 Tutorial.
+ */
+
+#include "hdf5.h"
+#define FILE "dset.h5"
+
+int
+main()
+{
+
+    hid_t  file_id, dataset_id; /* identifiers */
+    herr_t status;
+    int    i, j, dset_data[4][6];
+
+    /* Initialize the dataset. */
+    for (i = 0; i < 4; i++)
+        for (j = 0; j < 6; j++)
+            dset_data[i][j] = i * 6 + j + 1;
+
+    /* Open an existing file. */
+    file_id = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT);
+
+    /* Open an existing dataset. */
+    dataset_id = H5Dopen2(file_id, "/dset", H5P_DEFAULT);
+
+    /* Write the dataset. */
+    status = H5Dwrite(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset_data);
+
+    status = H5Dread(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset_data);
+
+    /* Close the dataset. */
+    status = H5Dclose(dataset_id);
+
+    /* Close the file. */
+    status = H5Fclose(file_id);
+}