nan(2): document isInf(x, 0) matching +∞ and -∞

2021-02-18 21:40:30 +01:00 · 2021-02-18 21:40:30 +01:00 · 1ce6f0f2ab
parent ca1542a199
commit 1ce6f0f2ab
1 changed files with 3 additions and 1 deletions
--- 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"