Add forward ref to help users find property types

  As requested by James Harkins

diff --git a/Documentation/learning/tweaks.itely b/Documentation/learning/tweaks.itely
index 569ea32b2711384e445fe5f8c38854bb2a494474..1af29f9eb45c7a43a44178a61b78ce22db3fc9c2 100644 (file)
--- a/Documentation/learning/tweaks.itely
+++ b/Documentation/learning/tweaks.itely
@@ -214,9 +214,10 @@ level contexts, i.e., @code{Voice}, @code{ChordNames} or
 examples.  We shall see later when it must be specified.
 
 Later sections deal comprehensively with properties and their
-values, but to illustrate the format and use of these commands
-we shall use just a few simple properties and values which are
-easily understood.
+values, see @ref{Types of properties}.  But in this section we shall 
+use just a few simple properties and values which are easily
+understood in order to illustrate the format and use of these
+commands.
 
 For now, don't worry about the @code{#'}, which must precede the
 layout property, and the@tie{}@code{#}, which must precede the value.