http://lilypond.org/easier-editing.html

[Rafael Fontenelle]

(The related source file is: web/introduction.itexi)

In the description paragraph for Frescobaldi:

Frescobaldi is a lightweight, yet powerful, music and text editor with
many features added and enhanced particularly for LilyPond. Major
features include point-and-click links between the code and music
views, detailed score wizards, built in LilyPond documentation
browser, syntax highlighting and automatic completion. Frescobaldi is
written in Python, with PyQt4 for its user interface, and will run on
all major operating systems (GNU/Linux, Mac OS X and Windows).

The "built in LilyPond documentation browser" should be "built-in
LilyPond documentation browser" (hyphen added)

Best regards,
Rafael Fontenelle