[PATCH 173/177] man/curs_util.3x: Standardize and annotate SVr4 return value admonition.

[G. Branden Robinson]

...resurrected and recast from earlier commit.
---
 man/curs_util.3x | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/man/curs_util.3x b/man/curs_util.3x
index 65b5ef653..c7f165a09 100644
--- a/man/curs_util.3x
+++ b/man/curs_util.3x
@@ -366,6 +366,10 @@ .SH NOTES
 .SH PORTABILITY
 X/Open Curses Issue\ 4 describes these functions.
 It specifies no error conditions for them.
+.PP
+SVr4 describes a successful return value only as
+\*(``an integer value other than
+.IR ERR \*(''. \" Courier roman in source; SVID 4, vol. 3, p. 542
 .SS filter
 The SVr4 documentation describes the action of \fBfilter\fP
 only in the vaguest terms.
-- 
2.30.2

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