[PATCH 15/23] man/curs_addch.3x: Add extension usage caveat to "PORTABILITY" section.

[G. Branden Robinson]

---
 man/curs_addch.3x | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/man/curs_addch.3x b/man/curs_addch.3x
index a3c1e68ed..461e0828e 100644
--- a/man/curs_addch.3x
+++ b/man/curs_addch.3x
@@ -284,6 +284,12 @@ .SS TABSIZE
 but X/Open Curses does not specify it;
 see \fB\%curs_variables\fP(3X).
 .SH PORTABILITY
+Applications employing
+.I \%ncurses
+extensions should condition their use on the visibility of the
+.B \%NCURSES_VERSION
+preprocessor macro.
+.PP
 X/Open Curses,
 Issue 4 describes these functions.
 It specifies no error conditions for them.
-- 
2.30.2

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