WordPress at a glance
action is not described

generate_rewrite_rules action-hook . WP 1.5.0

Fires after the rewrite rules are generated.

Usage

add_action( 'generate_rewrite_rules', 'action_function_name_9731' );
function action_function_name_9731( $this ){
	// action...
}
$this(WP_Rewrite)
Current WP_Rewrite instance (passed by reference).

Where the hook is called

WP_Rewrite::rewrite_rules()
wp-includes/class-wp-rewrite.php 1397
do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );

Where the hook is used (in WP core)

Does not used.