Document that the curses UI exists in the README.

diff --git a/README.md b/README.md
index fce990d79473e2335d9a040edda75a07e8a7f289..728260eda23e907dee20d3e889beec73cf846e86 100644 (file)
--- a/README.md
+++ b/README.md
@@ -9,12 +9,19 @@ still buy in 2022.
 
 RRace is written in C, so a working C compiler is compiled.
 
+To build the terminal UI, a curses library is required.  Both
+[ncurses][ncurses-homepage] and [PDcurses][pdcurses-homepage] are free
+software curses implementations that are fully supported.  Other
+implementations may work.
+
 To build the UI for X11 systems, the [Motif toolkit][motif-homepage] is
 required.
 
 Optionally, in order to support localized program messages the [GNU libintl
-library][gettext-homepage] (included wit the GNU C library) is required.
+library][gettext-homepage] (included with the GNU C library) is required.
 
+[ncurses-homepage]: https://invisible-island.net/ncurses/
+[pdcurses-homepage]: https://pdcurses.org/
 [motif-homepage]: https://sourceforge.net/projects/motif/
 [gettext-homepage]: https://www.gnu.org/software/gettext/