Fix license header
diff --git a/Sources/ApacheBeam/Core/PCollection/PCollectionGroup.swift b/Sources/ApacheBeam/Core/PCollection/PCollectionGroup.swift
index e4b43cf..888d57b 100644
--- a/Sources/ApacheBeam/Core/PCollection/PCollectionGroup.swift
+++ b/Sources/ApacheBeam/Core/PCollection/PCollectionGroup.swift
@@ -1,9 +1,20 @@
-//
-// File.swift
-//
-//
-// Created by Byron Ellis on 9/21/23.
-//
+/*
+ * 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.
+ */
import Foundation
