-A simpler, but more limited syntax is also described in
-@ref{Music notation inside markup}.
+However, all these glyphs except the braces of various sizes
+contained in @code{fetaBraces} are available using the
+simpler syntax described in @ref{Music notation inside markup}.
+
+When using the glyphs contained in @code{fetaBraces}, the size of
+the brace is specified by the numerical part of the glyph name, in
+arbitrary units. Any integer from @code{0} to @code{575} inclusive
+may be specified, @code{0} giving the smallest brace. The optimum
+value must be determined by trial and error. These glyphs are all
+left braces; right braces may be obtained by rotation, see
+@ref{Rotating objects}.