Making /etc/fstab persistent in live-system

[Are Venes]

Hello

This is my first time using a mailing list, so please let me know if I am
doing it the wrong way.
My question/problem is the following:

I am currently developing my own custom live-system out of Ubuntu 10.04. I
use Remastersys and USB-live-Creator for making it bootable.

I can`t get the /etc/fstab to be persistant, I can make changes to it, but
as soon as i reboot, it is changed back two the same two lines as were there
before..

Does anyone know how I can make them persistable? Really need to have my own
partition mounted with given rights during boot-time.

Thankful for every answer!

Regards
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