diff --git a/core/optaplanner-core-impl/src/main/resources/solver.xsd b/core/optaplanner-core-impl/src/main/resources/solver.xsd
index 72452d8d0f7..d94d93104fb 100644
--- a/core/optaplanner-core-impl/src/main/resources/solver.xsd
+++ b/core/optaplanner-core-impl/src/main/resources/solver.xsd
@@ -1,4 +1,22 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!--
+  ~ 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.
+  -->
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="https://www.optaplanner.org/xsd/solver" elementFormDefault="qualified" targetNamespace="https://www.optaplanner.org/xsd/solver" version="1.0">
     
   <xs:element name="solver" type="tns:solverConfig"/>