How to comply with Apache 2.0 requirement to state that changes have been made to a file

Question

I have made a copy of an open source project that is licensed under the Apache 2.0 license, and I have made modifications to some of its files. I want to release my modified version to the general public.

According to the Apache 2.0 license clause 4(b):

You must cause any modified files to carry prominent notices stating that You changed the files; and

How do I comply with the requirement to "carry prominent notices"?

All the files I modified have this header written by the original author of the project:

/*
 * Copyright 2018 Acme Corporation
 *
 * Licensed 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.
 */

What exactly do I add to this header such that it will carry a "prominent notice" that I have changed the file?

Answer 1

Generally, adding your own copyright line is considered to be a prominent enough notice that you modified the file.

Thus, add a line Copyright 2022 Flux next to the existing line(s) that have the same form.