diff --git a/Doxyfile b/Doxyfile
index 92e4109be..11311ad1b 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -1,5 +1,24 @@
 # Doxyfile 1.9.1
 
+#
+# 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
+#
+
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project.
 #