When you are creating some reusable code or even any other code, you need to leave comments. For some reason, there is a current (and discourteous) trend for programmers not to add comments "their code doesn't need additional description." Another school of thought is, "That's my code. I understand what I am writing". Do you think it is fair to leave it as it is? Of course, the answer is no! Even your memory isn't perfect. You can forget what you mean in your code and what the purpose was. It is recommended you at least write short comments for yourself and other people who will work on the project.
In the golden era of Github and Bitbucket, you can share your code in seconds and work with another programmer from another part of the world who can fork your code or contribute to your project.