[Zope] Log in Plain Text

Hi, I'm interested in tracing actions of my code to a plain txt file in each folder of the application. I just want to add one or more lines to the log after some actions take place, and I want to know if there's a simple method to write one line to that log.txt I think I can use "manage_editFile", but it implies reading all the content and adding the new line, but I'm not interested in reading it, just add the line!! I think it would be a useless-complex-method reading it before Help, please. Thanks in advance