Update Module (install.php)

Hi,
I have developed a small module. After I installed it i realised that i forgot a column in the table. This should not be a problem, because of the update hook. But my module is not shown in the selection screen of the update.php file. There are some, but not mine. The following shows my install.php coding:

function productManagement_install() {
  switch ($GLOBALS['db_type']) {
    case 'mysql':
    case 'mysqli':
      // the {tablename} syntax is so multisite installs can add a
      // prefix to the table name as set in the settings.php file
      
	  db_query("CREATE TABLE {productManagement_test} (
		  `id` int(11) NOT NULL auto_increment,
		  PRIMARY KEY  (`id`)
		) ENGINE=MyISAM;");
	
	return $ret;
  }
}

function productManagement_update_6001(){
	$ret = array();	
	$ret[] = update_sql("  ALTER TABLE `{productManagement_test}` ADD `pr1` INT( 1 ) NOT NULL  ;");
	return $ret;
}

function productManagement_update_6002(){
	$ret = array();	
	$ret[] = update_sql("  ALTER TABLE `{productManagement_test}` ADD `pr2` INT( 1 ) NOT NULL  ;");
	return $ret;
}

function productManagement_uninstall() {

	db_query("DROP TABLE {productManagement_test}");

	  
	  cache_clear_all('*', 'cache', TRUE);
	  cache_clear_all('*', 'cache_filter', TRUE);
	  cache_clear_all('*', 'cache_menu', TRUE);
	  cache_clear_all('*', 'cache_page', TRUE);	  
}

Thanks for your help!!!
Regards francula