-If three or more notes line up in the same column,
-@code{merge-differently-headed} cannot successfully complete the
-merge of the two notes that should be merged. To allow the merge
-to work properly, apply a @code{\shift} to the note that should
-not be merged. In the first measure of following example,
-@code{merge-differently-headed} does not work (the half-note head
-is solid). In the second measure, @code{\shiftOn} is applied to
-move the top @code{g} out of the column, and
-@code{merge-differently-headed} works properly.
-
-@lilypond[quote,ragged-right,fragment,verbatim,relative=2]
-\override Staff.NoteCollision #'merge-differently-headed = ##t
-<<
- { d=''2 g2 } \\
- { \oneVoice d=''8 c8 r4 e,8 c'8 r4 } \\
- { \voiceFour e,,2 e'2}
->>
+The collision on the second measure happens because
+@code{merge-differently-headed} cannot successfully complete the merge
+when three or more notes line up in the same column (in fact, you will
+obtain a warning for this reason). To allow the merge to work
+properly, apply a @code{\shift} to the note that should not be merged.
+Here, @code{\shiftOn} is applied to move the top @code{g} out of the
+column, and @code{merge-differently-headed} works properly.
+
+@lilypond[quote,relative=2,verbatim]