-This module parses and runs BulletML scripts. BulletML is a markup
-language for describing complex bullet patterns in shooting games.
-More information is available at the BulletML homepage,
-http://www.asahi-net.or.jp/~cs8k-cyu/bulletml/index_e.html.
+BulletML is the Bullet Markup Language. BulletML can describe the
+barrage of bullets in shooting games. (For example Progear, Psyvariar,
+Gigawing2, G DARIUS, XEVIOUS, ...) This module parses and executes
+BulletML scripts in Python. All data structures in it are
+renderer-agnostic.
+
+In addition to the standard BulletML XML format, this module supports
+an equivalent YAML format.