Doc: Bar_engraver is required for system-start clefs (2694)

diff --git a/lily/bar-engraver.cc b/lily/bar-engraver.cc
index b2594a2cb871a8f4b5cff207083e36b18245aaf3..c2abb8cd85b05a7df84a85ad66bb1f595303a992 100644 (file)
--- a/lily/bar-engraver.cc
+++ b/lily/bar-engraver.cc
@@ -115,7 +115,9 @@ ADD_TRANSLATOR (Bar_engraver,
                 /* doc */
                 "Create barlines.  This engraver is controlled through the"
                 " @code{whichBar} property.  If it has no bar line to create,"
-                " it will forbid a linebreak at this point.",
+                " it will forbid a linebreak at this point.  This engraver"
+                " is required to trigger the creation of clefs at the start"
+                " of systems.",
 
                 /* create */
                 "BarLine ",