+ texidoc = "
+The @code{measureLength} property, together with
+@code{measurePosition}, determines when a bar line is needed. However,
+when using @code{\\scaleDurations}, the scaling of durations makes it
+difficult to change time signatures. In this case,
+@code{measureLength} should be set manually, using the
+@code{ly:make-moment} callback. The second argument must be the same
+as the second argument of @code{\\scaleDurations}.
+
+"