* doc/lispref/display.texi (Low-Level Font): Add an index for font registry.

doc/lispref/ChangeLog

@@ -2,6 +2,7 @@
 
 	* display.texi (Face Remapping): Add indexes for face remapping.
 	(Font Selection): Add indexes for font selection.
+	(Low-Level Font): Add an index for font registry.
 
 2013-10-23  Glenn Morris  <rgm@gnu.org>
 

doc/lispref/display.texi

@@ -3241,6 +3241,7 @@ size, or a floating point number that specifies the point size.
 Additional typographic style information for the font, such as
 @samp{sans}.  The value should be a string or a symbol.
 
+@cindex font registry
 @item :registry
 The charset registry and encoding of the font, such as
 @samp{iso8859-1}.  The value should be a string or a symbol.