--- signbit.3.orig 2009-11-07 14:51:38.000000000 -0800 +++ signbit.3 2009-11-07 14:51:39.000000000 -0800 @@ -40,8 +40,9 @@ The .Fn signbit macro takes an argument of -.Fa x -and returns non-zero if the value of its sign is negative, otherwise 0. +.Fa x . +It returns non-zero if the value of the argument's sign is negative, +otherwise 0. .Sh SEE ALSO .Xr fpclassify 3 , .Xr math 3 @@ -50,8 +51,3 @@ The .Fn signbit macro conforms to .St -isoC-99 . -.Sh HISTORY -The -.Fn signbit -macro was added in -.Fx 5.1 .