Add index entries for polymetric signatures.

diff --git a/Documentation/user/advanced-notation.itely b/Documentation/user/advanced-notation.itely
index 553eff96d980efc22c57558eadb01e7d8a76e6eb..49163a8f2833de30b4198abf2aac560ab9ef75b2 100644 (file)
--- a/Documentation/user/advanced-notation.itely
+++ b/Documentation/user/advanced-notation.itely
@@ -1708,6 +1708,11 @@ see those sections of the documentation.
 @node Polymetric notation
 @subsection Polymetric notation
 
+@cindex double time signatures
+@cindex signatures, polymetric
+@cindex polymetric signatures
+@cindex meter, polymetric
+
 Double time signatures are not supported explicitly, but they can be
 faked.  In the next example, the markup for the time signature is
 created with a markup text.  This markup text is inserted in the