# RETRO 2020.4 - remove deprecated words as{ }as " prefix:" - examplse markdown.retro - future underscores in word namesv Prior RETRO images had a patch that allowed underscores to be used in word names. In this release, the patch is no longer part of the standard library, but is still included on Unix targets by default. This might affect some users, if you are building a custom image, load package/allow-underscores-in-names.forth if you need this. modularity Work towards allowing portions of the standard library to be optional is ongoing. During this, the internal organization of retro.forth is changing and some small parts may be duplicated in an effort to allow for more flexibility in the long term.