PHPStorm: Notes Plugin

I am looking for a plugin in PHPStorm to take notes in a file.

Often I forget important informations (like: What I did, why I did this or which ticket id is assigned to the code) in a file, as these things are not discussed and committed until weeks later.

So it would be nice if there is a plugin which allowed me to take notes for a file. Only local and only for me.

Before you ask me why I don't use PHP Comments (//, /**/): We use SVN in our team and we don't like it to find personal comments and notes in the whole code...

Is there a plugin / function for me? I can't find any...