* text.texi (Maintaining Undo): Mention interactive call of
buffer-disable-undo.
+ (Filling): Add cross-reference for hard newlines.
2013-08-16 Xue Fuqiao <xfq.free@gmail.com>
@defvar use-hard-newlines
If this variable is non-@code{nil}, the filling functions do not delete
newlines that have the @code{hard} text property. These ``hard
-newlines'' act as paragraph separators.
+newlines'' act as paragraph separators. @xref{Hard and Soft
+Newlines,, Hard and Soft Newlines, emacs, The GNU Emacs Manual}.
@end defvar
@node Margins