-Simultaneous or overlapping slurs are not permitted, but a phrasing
-slur can overlap a slur. This permits two slurs to be printed at
-once. For details, see @ref{Phrasing slurs}.
+Simultaneous or overlapping slurs require special attention. Most
+occurences of outer slurs actually indicate phrasing, and phrasing
+slurs may overlap a regular slur, see @ref{Phrasing slurs}. When
+multiple regular slurs are needed in a single @code{Voice},
+matching slur starts and ends need to be labelled by preceding
+them with @code{\=} followed by an identifying key (a symbol or
+non-negative integer).
+
+@lilypond[verbatim,quote]
+\fixed c' {
+ <c~ f\=1( g\=2( >2 <c e\=1) a\=2) >
+}
+@end lilypond