From 1ce6f0f2ab1896e35869f0e9e5079fc20dd981fc Mon Sep 17 00:00:00 2001
From: kvik <kvik@a-b.xyz>
Date: Thu, 18 Feb 2021 21:40:30 +0100
Subject: [PATCH] =?UTF-8?q?nan(2):=20document=20isInf(x,=200)=20matching?=
 =?UTF-8?q?=20+=E2=88=9E=20and=20-=E2=88=9E?=
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---
 sys/man/2/nan | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/man/2/nan b/sys/man/2/nan
index 90e39b994..d5edc589b 100644
--- a/sys/man/2/nan
+++ b/sys/man/2/nan
@@ -45,7 +45,9 @@ is greater than or equal to zero,
 else negative infinity.
 .I IsInf
 returns true if its first argument is infinity
-with the same sign as the second argument.
+with a sign matching the second argument.
+A zero sign matches both negative and positive
+infinities.
 .SH SOURCE
 .B /sys/src/libc/port/nan.c
 .SH "SEE ALSO"