From d41a0a779df30468ae56675fc6bddfec458d1210 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Thu, 7 Aug 2008 06:57:15 +0000
Subject: [PATCH] CONFORMING TO: Note that the standards provide a weaker
 guarantee for the return value of isinf().

---
 man3/fpclassify.3 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/man3/fpclassify.3 b/man3/fpclassify.3
index 7da8a4a2a..9c4989e05 100644
--- a/man3/fpclassify.3
+++ b/man3/fpclassify.3
@@ -3,7 +3,7 @@
 .\" This was done with the help of the glibc manual.
 .\"
 .\" 2004-10-31, aeb, corrected
-.TH FPCLASSIFY 3  2008-08-05 "" "Linux Programmer's Manual"
+.TH FPCLASSIFY 3  2008-08-07 "" "Linux Programmer's Manual"
 .SH NAME
 fpclassify, isfinite, isnormal, isnan, isinf \- floating-point
 classification macros
@@ -100,6 +100,11 @@ is positive infinity, and \-1 if
 is negative infinity.
 .SH "CONFORMING TO"
 C99, POSIX.1.
+
+For
+.BR isinf (),
+the standards merely say that the return value is non-zero
+if and only if the argument has an infinite value.
 .SH NOTES
 In glibc 2.01 and earlier,
 .BR isinf ()