newbie: how do I add my disclaimer?

[isaac gouy]

I've written several programs which were originally
based on publicly available source code.

The original source code came with License and
Disclaimer, which I'll distribute along with my
variations. 
That disclaimer doesn't protect me, it protects the
authors of the original source code. How do I add a
disclaimer that protects me?

Do I just stick another disclaimer in the same
document as the original disclaimer and license?

puzzled, Isaac

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