I have written some code that implements an interface that is common between a project I am working on and a different project that a coworker is working on.
It was understood and agreed upon that this code would be common between the projects, and thus one person would write it and both would utilize it.
He asked for help related to the file, and when I opened the file on his project, I noticed that he had changed the "Author:" line from my name to his, without modifying any other portion of the code. This irritates me because I feel like he is trying to take credit for something that I did. I have always been very open in sharing my knowledge with him and providing guidance and assistance, and now I feel somewhat stabbed in the back.
I know it's technically the company's source code and neither of us "own" it, but I feel like he may be taking away an opportunity for me to get acknowledged and rewarded for doing a good job on this code.
How should I pursue correcting this?