[AUCTeX] using a derivative of article class

[Seweryn Kokot]

Hello,

I put my preamble with some \usepackage (unit,amsmath) into my own
class - a derivative of article class:
--- start
% myart.cls file
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{myart}
\DeclareOption*{%
  \PassOptionsToClass{\CurrentOption}{article}}
\ProcessOptions
\LoadClass{article}
%
\RequirePackage{amsmath,amssymb}            % counterparts of \usepackage
\RequirePackage[a4paper,left=2.5cm,right=3.0cm,top=2.5cm,bottom=2.5cm]{geometry}
\RequirePackage{units}
\sloppy
\endinput
--- end

Now my tex file looks like this:
--- start
\documentclass{myart}
\begin{document}
...
--- end

and auctex doesn't see and include unit and amsmath styles. 

Is it possible to make the styles visible for auctex in any way?

Regards,
SK