Add index entries for `volta'.

diff --git a/Documentation/user/basic-notation.itely b/Documentation/user/basic-notation.itely
index dddc793973825a45ec49a4f2eee6ce80503cc668..ad2cc92492fd2833b46cbfa6467986f8f239f2ba 100644 (file)
--- a/Documentation/user/basic-notation.itely
+++ b/Documentation/user/basic-notation.itely
@@ -3046,6 +3046,10 @@ 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