Doc: Usage: add xref to lilypond-book options section.

diff --git a/Documentation/usage/lilypond-book.itely b/Documentation/usage/lilypond-book.itely
index 51b5013e9d3a5b50d477dfb3cb7740c08fec9a00..80ed297ea2778737a6764b8e8a3283ba160279d3 100644 (file)
--- a/Documentation/usage/lilypond-book.itely
+++ b/Documentation/usage/lilypond-book.itely
@@ -454,6 +454,7 @@ Music is entered using
 \key c \minor c4 es g2
 </lilypond>
 @end example
+
 @noindent
 @command{lilypond-book} then produces an HTML file with appropriate image
 tags for the music fragments:
@@ -469,13 +470,15 @@ are separated by a colon from the music, for example
 Some music in <lilypond relative=2: a b c/> a line of text.
 @end example
 
-
 To include separate files, say
 
 @example
 <lilypondfile @var{option1} @var{option2} ...>@var{filename}</lilypondfile>
 @end example
 
+For a list of options to use with the @code{lilypond} or
+@code{lilypondfile} tags, see @ref{Music fragment options}.
+
 Additionally, @code{<lilypondversion/>} displays the current version
 of lilypond.