bash scripting add arguments

I have created a script which takes parameters and arguments. I want to insert the --help argument.

I already know how to parse normal arguments with -, but I don't know how to parse the -- ones.

to parse optiopns for test.sh -h i use the following check

while getopts ":h" opt; 
do 
case $opt in
    h ) {
            echo "help!!!"
            exit 1
    } ;;
esac
done

But I want to have the option to call the script with test.sh --help

Thanks in advance.

P.S. I am using Ubuntu 12.04...but it doesn't really matter.

Apparently I can't answer my own question if I have so less rep. I found the solution in one of the .sh scripts from /usr/bin

  if test $# = 1; then
    case "$1" in
      --help | --hel | --he | --h )
        func_usage; exit 0 ;;
      --version | --versio | --versi | --vers | --ver | --ve | --v )
        func_version; exit 0 ;;
    esac
  fi