.\"
.\" Author: Thomas E. Dickey 1999-on
.\"
-.\" $Id: curs_extend.3x,v 1.43 2023/12/16 20:32:22 tom Exp $
-.TH curs_extend 3X 2023-12-16 "ncurses 6.4" "Library calls"
+.\" $Id: curs_extend.3x,v 1.44 2023/12/23 16:36:18 tom Exp $
+.TH curs_extend 3X 2023-12-23 "ncurses 6.4" "Library calls"
.ie \n(.g \{\
.ds `` \(lq
.ds '' \(rq
.PP
\fBuse_extended_names\fP returns the previous state, allowing you to
save this and restore it.
+.SH EXTENSIONS
+These functions are \fB\%ncurses\fP(3X) extensions,
+and are not found in SVr4
+.IR curses ,
+4.4BSD
+.IR curses ,
+or any other previous curses implementation.
.SH PORTABILITY
-These routines are specific to \fI\%ncurses\fP.
-They were not supported on
-Version 7, BSD or System V implementations.
-It is recommended that
-any code depending on them be conditioned using NCURSES_VERSION.
+Applications employing
+.I \%ncurses
+extensions should condition their use on the visibility of the
+.B \%NCURSES_VERSION
+preprocessor macro.
.SH AUTHORS
Thomas Dickey.
.SH SEE ALSO