Add index entries for `volta'.

diff --git a/Documentation/user/basic-notation.itely b/Documentation/user/basic-notation.itely
index aeeb5ed9d4cb5d9ca4f2deaa58eb6596e9dad886..1e1a59a874a8223096009f74da8a39edb5e342c2 100644 (file)
--- a/Documentation/user/basic-notation.itely
+++ b/Documentation/user/basic-notation.itely
@@ -3039,6 +3039,10 @@ declared within a @code{Voice} context.
 @node Repeat syntax
 @subsection Repeat syntax
 
+@cindex volta
+@cindex prima volta
+@cindex seconda volta
+
 LilyPond has one syntactic construct for specifying different types of
 repeats.  The syntax is