Make category_description visible

First off, I am a noob. So, please take it easy on me. I want to make the category_description visible when I navigate to the category.

I modified the category-template.php to modify the function from:

function category_description( $category = 0 ) {
//return term_description( $category, ‘category’ );
}

to:

function category_description( $category = 0 ) {
echo category_description( $category_id );
//return term_description( $category, ‘category’ );
}

However, the category description is still not visible. Can anyone please help?

Thanks,
Nash