@c TODO Should this be Modifying engravers or Modifying contexts?
-Notation contexts (like @code{Score} and @code{Staff}) not only
-store properties,
-they also contain plug-ins called @q{engravers} that create notation
-elements. For example, the @code{Voice} context contains a
+Notation contexts (like @code{Score} and @code{Staff}) not only store
+properties, they also contain plug-ins called @q{engravers} that create
+notation elements. For example, the @code{Voice} context contains a
@code{Note_heads_engraver} and the @code{Staff} context contains a
-@code{Key_signature_engraver}.
+@code{Key_engraver}.
For a full a description of each plug-in, see
@ifhtml