Easy function to add help tabs to WP Admin Pages

WP - Contextual Help Dropdown.php

add_filter( 'contextual_help', 'wptuts_contextual_help', 10, 3 );
function wptuts_contextual_help( $contextual_help, $screen_id, $screen ) {

    // Only add to certain screen(s). The add_help_tab function for screen was introduced in WordPress 3.3.
    if ( $screen_id == 'market-trends' || ! method_exists( $screen, 'add_help_tab' ) )
        return $contextual_help;

    $screen->add_help_tab( array(
        'id'      => 'wptuts-overview-tab',
        'title'   => __( 'Updating', 'plugin_domain' ),
        'content' => '<p>' . __( 'Some help text here', 'plugin_domain' ) . '</p>',
    ));
    return $contextual_help;
}