dll problem

Hello, I have a problem with dll file. I would be pleased if anyone could help me.I have created a dll(using visual basic) a few years ago. But there is no documentation left except the dll itself. I tried to view it using PE but I could not get detailed information.I can only see the function names and its parameters. However, I do not know which function does what.Can I view the dll more detailed? Because I want to use it for my new project.. thank you very much in advance Gulen