[AUCTeX] Customize tex-ispell.el

[Thorsten Grothe]

Hello,

I would like to add the environment of exsheets to tex-ispell.el,
because it's highlighted as error, the env looks like this:

\begin{question}[skip me}]{skip me}
ispell me please
\end{question}

But I have no idea how to do this. I know the file tex-ispell.el but if
I modify it, it get's overwritten with the next update.

Can anyone help me?

Thanks!

Regards

Thorsten Grothe