To determine the number of staves in a piece, LilyPond looks at
the beginning of the first expression. If there is a single note,
there is one staff; if there is a simultaneous expression, there
-is more than one staff.
+is more than one staff. The following example shows a complex
+expression, but as it begins with a single note it will be set
+out on a single staff.
@lilypond[verbatim,quote]
\relative c'' {