... but we do provide .St -isoC-99, and it is not required to have the

history info as:

: .Sh STANDARDS   If the command, library function or file adheres to a
:                 specific implementation such as IEEE Std 1003.2
:                 (``POSIX.2'') or ANSI X3.159-1989 (``ANSI C'') this
:                 should be noted here.  If the command does not adhere
:                 to any standard, its history should be noted in the
:                 HISTORY section.

lib/libc/string/wmemchr.3

@@ -137,11 +137,7 @@ counterpart, such as
 .Xr strstr 3
 .Sh STANDARDS
 These functions conform to
-.\" .St -isoC99
-ISO/IEC 9899:1999 (``ISO C99'')
-and were first introduced in
-.\" .St -isoC-amd1 ,
-ISO/IEC 9899/AMD1:1995 (``ISO C90'')
+.St -isoC-99 ,
 with the exception of
 .Fn wcslcat
 and