* doc/lsipref/display.texi (Overlay Properties): Mention field.

Fixes: debbugs:13364

doc/lispref/ChangeLog

+2013-01-05  Glenn Morris  <rgm@gnu.org>
+
+	* display.texi (Overlay Properties): Mention field.  (Bug#13364)
+
 2013-01-05  Eli Zaretskii  <eliz@gnu.org>
 
 	* hooks.texi (Standard Hooks): Use @item, not @itemx, as the first

doc/lispref/display.texi

@@ -1559,6 +1559,14 @@ mouse onto the text in the overlay, Emacs displays a help string in the
 echo area, or in the tooltip window.  For details see @ref{Text
 help-echo}.
 
+@item field
+@kindex field @r{(overlay property)}
+@c Copied from Special Properties.
+Consecutive characters with the same @code{field} property constitute a
+@emph{field}.  Some motion functions including @code{forward-word} and
+@code{beginning-of-line} stop moving at a field boundary.
+@xref{Fields}.
+
 @item modification-hooks
 @kindex modification-hooks @r{(overlay property)}
 This property's value is a list of functions to be called if any