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diff --git a/include/proj/internal/crs_internal.hpp b/include/proj/internal/crs_internal.hpp
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+++ b/include/proj/internal/crs_internal.hpp
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+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  ISO19111:2019 implementation
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2021, Even Rouault <even dot rouault at spatialys dot com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#ifndef FROM_PROJ_CPP
+#error This file should only be included from a PROJ cpp file
+#endif
+
+#ifndef CRS_INTERNAL_HH_INCLUDED
+#define CRS_INTERNAL_HH_INCLUDED
+
+#define NORMALIZED_AXIS_ORDER_SUFFIX_STR                                       \
+    " (with axis order normalized for visualization)"
+
+#define AXIS_ORDER_REVERSED_SUFFIX_STR " (with axis order reversed)"
+
+#endif // CRS_INTERNAL_HH_INCLUDED