diff --git a/src/common/backend/utils/adt/f2s.cpp b/src/common/backend/utils/adt/f2s.cpp
index 7fc9677b0..b528623d6 100644
--- a/src/common/backend/utils/adt/f2s.cpp
+++ b/src/common/backend/utils/adt/f2s.cpp
@@ -1,24 +1,36 @@
-/*
- * Copyright (c) 2024 Huawei Technologies Co.,Ltd.
+/*---------------------------------------------------------------------------
  *
- * openGauss is licensed under Mulan PSL v2.
- * You can use this software according to the terms and conditions of the Mulan PSL v2.
- * You may obtain a copy of Mulan PSL v2 at:
+ * Ryu floating-point output for single precision.
  *
- *          http://license.coscl.org.cn/MulanPSL2
- *
- * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
- * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
- * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
- * See the Mulan PSL v2 for more details.
- * -------------------------------------------------------------------------
- *
- * f2s.cpp
+ * Portions Copyright (c) 2024, openGauss Contributors
+ * Portions Copyright (c) 2018-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *        src/common/backend/utils/adt/f2s.cpp
+ *	  src/common/backend/utils/adt/f2s.cpp
  *
- * -------------------------------------------------------------------------
+ * This is a modification of code taken from github.com/ulfjack/ryu under the
+ * terms of the Boost license (not the Apache license). The original copyright
+ * notice follows:
+ *
+ * Copyright 2018 Ulf Adams
+ *
+ * The contents of this file may be used under the terms of the Apache
+ * License, Version 2.0.
+ *
+ *     (See accompanying file LICENSE-Apache or copy at
+ *      http://www.apache.org/licenses/LICENSE-2.0)
+ *
+ * Alternatively, the contents of this file may be used under the terms of the
+ * Boost Software License, Version 1.0.
+ *
+ *     (See accompanying file LICENSE-Boost or copy at
+ *      https://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Unless required by applicable law or agreed to in writing, this software is
+ * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.
+ *
+ *---------------------------------------------------------------------------
  */
 
 #ifndef FRONTEND