This is not a high quality man page but the following diff corrects the error.
- todd Index: lib/libc/gen/isgreater.3 =================================================================== RCS file: /cvs/src/lib/libc/gen/isgreater.3,v retrieving revision 1.3 diff -u -p -u -r1.3 isgreater.3 --- lib/libc/gen/isgreater.3 7 Jul 2011 13:30:28 -0000 1.3 +++ lib/libc/gen/isgreater.3 28 Aug 2017 15:47:10 -0000 @@ -79,11 +79,7 @@ macro takes arguments .Fa x and .Fa y -and returns non-zero if and only if neither -.Fa x -nor -.Fa y -are NaNs. +and returns non-zero if at least one of the arguments is NaN. For any pair of floating-point values, one of the relationships (less, greater, equal, unordered) holds. .Sh SEE ALSO
