Can't enable WPMU from WO-Config.php

I follow WordPress's instruction to add following 2nd line in WP-Config.php, it shall show up Network under Dashboard TOOL, but it doesn't, Does BlueHost support WPMU

Add the following line to your wp-config.php file:

define(‘WP_ALLOW_MULTISITE’, true);

above where it says /* That’s all, stop editing! Happy blogging. */: